Overclocking E6600 on Asus P5W DH Deluxe

"Phil Weldon" <notdiscosed RemoveThis @example.com> wrote in message
news:ePOPh.133340$_73.98260@newsread2.news.pas.earthlink.net...
> 'Nick Le Lievre' wrote:
> | Can somebody explain the fsb/multiplier settings the chip would be set
> to
> at
> | stock... and what changes I would need to make to run this at 2.8 >
> 3.0ghz
> |
> | I havent built a system with core 2 duo yet and my expierience with
> | overclocking is with thoroughbred B AMD XP chips which overclocked by
> | running them at 166mhz fsb rather then 133 what do you do with core 2
> duo
> | chips to overclock.
> _____
>
> You overclock the Intel E6600 the same as with all Intel CPUs produced
> this
> century save for the Core 2 Extreme X6800 and the Core 2 Extreme QX6700.
> You raise the FrontSide Bus speed because the multiplier is locked and
> cannot be increased. The 65 nm feature size Core 2 Duo Intel series is so
> overclockable that you have a good chance of overclocking from the stock
> 2.4
> GHz to 3.0 GHz with the standard Intel boxed retail heatsink/fan and the
> default core voltage. Since that means an FSB of 1333 MHz, you need a
> motherboard that will work with the FSB set to 1333, and will, since there
> is no PC10600 yet, need to set the CPU:Memory clock ratio to run the
> memory
> you actually have within its speed capabilities. Things like raising the
> CPU core voltage and extra cooling for even higher overclocks are used
> much
> the same as for AMD CPUs. (If you wish, you can think of an FSB of 1333
> MHz
> as 4 X 333 MHz.)
>

So what is an FSB of 1333mhz is that DDR2 1333mhz... i mean in terms of like
200mhz fsb used to be 400mhz DDR. What would 1333mhz DDR2 be in terms of fsb
speed.... don't these core 2 duo chips sometimes use and fsb of 166mhz still
becuase on my brothers PC I he was running an E6300 at 333mhz DDR I think...
that was really 166mhz fsb or was it actually 333fsb and things have moved
on a lot since the AMD days. What are the current fsb speeds used on Core 2
Duo CPUs and can you tell me the DDR speed and the actual non DDR speed as
what you'd actually set in the BIOS... the DDR FSB is only theoretical
becuase the ram runs at double data rate.... has this increased further
since DDR2 is it now quadruple data rate? I am confused.
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

'Nick Le Lievre' wrote, in part:
| So what is an FSB of 1333mhz is that DDR2 1333mhz... i mean in terms of
like
| 200mhz fsb used to be 400mhz DDR. What would 1333mhz DDR2 be in terms of
fsb
_____

DDR2 has nothing to do with the FrontSide Bus speed.

The Intel Pentium and Core 2 Duo CPUs use a 'quad-pumped' memory transfer; 4
memory transfer phases per memory transfer clock with SDRAM, RDRAM, DDR RAM,
and DDR2 RAM.

The Intel Core 2 Duo CPU has an X9 multiplier.

This multiplier cannot be increased.

The number you set in the BIOS to get a 3 GHz CPU clock for the E6600 is 333
MHz.

That is the only choice to get 3.0 GHz from a 2.4 GHz Intel CPU.

The E6600 has a multiplier of 9.

266 MHz * 9 = 2.4 GHz (that's the standard speed for an E6600)

333 MHz * 9 = 3 GHz (that's an easy overclock for an E6600)

400 MHz * 9 = 3.6 GHz ( about the limit for an E6600 without exotic cooling)

If the motherboard uses DDR2 memory, to get a CPU clock rate for your E6600
you either must have DDR2 memory that will work at PC10600 rates, OR you
must use a CPU:memory ratio that brings the memory clock down to whatever
speed you CAN get out of your memory.

Phil Weldon

"Nick Le Lievre" <nicklelievre DeleteThis @jerseymail.co.uk.invalid> wrote in message
news:460fbba1$0$21942$834e42db@reader.greatnowhere.com...
| "Phil Weldon" <notdiscosed DeleteThis @example.com> wrote in message
| news:ePOPh.133340$_73.98260@newsread2.news.pas.earthlink.net...
| > 'Nick Le Lievre' wrote:
| > | Can somebody explain the fsb/multiplier settings the chip would be set
| > to
| > at
| > | stock... and what changes I would need to make to run this at 2.8 >
| > 3.0ghz
| > |
| > | I havent built a system with core 2 duo yet and my expierience with
| > | overclocking is with thoroughbred B AMD XP chips which overclocked by
| > | running them at 166mhz fsb rather then 133 what do you do with core 2
| > duo
| > | chips to overclock.
| > _____
| >
| > You overclock the Intel E6600 the same as with all Intel CPUs produced
| > this
| > century save for the Core 2 Extreme X6800 and the Core 2 Extreme QX6700.
| > You raise the FrontSide Bus speed because the multiplier is locked and
| > cannot be increased. The 65 nm feature size Core 2 Duo Intel series is
so
| > overclockable that you have a good chance of overclocking from the stock
| > 2.4
| > GHz to 3.0 GHz with the standard Intel boxed retail heatsink/fan and the
| > default core voltage. Since that means an FSB of 1333 MHz, you need a
| > motherboard that will work with the FSB set to 1333, and will, since
there
| > is no PC10600 yet, need to set the CPU:Memory clock ratio to run the
| > memory
| > you actually have within its speed capabilities. Things like raising
the
| > CPU core voltage and extra cooling for even higher overclocks are used
| > much
| > the same as for AMD CPUs. (If you wish, you can think of an FSB of 1333
| > MHz
| > as 4 X 333 MHz.)
| >
|
| So what is an FSB of 1333mhz is that DDR2 1333mhz... i mean in terms of
like
| 200mhz fsb used to be 400mhz DDR. What would 1333mhz DDR2 be in terms of
fsb
| speed.... don't these core 2 duo chips sometimes use and fsb of 166mhz
still
| becuase on my brothers PC I he was running an E6300 at 333mhz DDR I
think...
| that was really 166mhz fsb or was it actually 333fsb and things have moved
| on a lot since the AMD days. What are the current fsb speeds used on Core
2
| Duo CPUs and can you tell me the DDR speed and the actual non DDR speed as
| what you'd actually set in the BIOS... the DDR FSB is only theoretical
| becuase the ram runs at double data rate.... has this increased further
| since DDR2 is it now quadruple data rate? I am confused.
|
|
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

"Phil Weldon" <notdiscosed.DeleteThis@example.com> wrote in message
news:7NQPh.17140$PL.3891@newsread4.news.pas.earthlink.net...
>
> If the motherboard uses DDR2 memory, to get a CPU clock rate for your
> E6600
> you either must have DDR2 memory that will work at PC10600 rates, OR you
> must use a CPU:memory ratio that brings the memory clock down to whatever
> speed you CAN get out of your memory.
>

So if I want to get 333 * 9 out of my mates E6600 I would need PC10600 DDR2
memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I use?
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

'Nick Le Lievre' wrote:
| So if I want to get 333 * 9 out of my mates E6600 I would need PC10600
DDR2
| memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I use?
_____

5 : 3

Your friend's PC6400 DDR2 memory is specified to operate with a 200 MHz
clock.
He has an E6600 CPU that is specified to operate with a 266 MHz clock.

E6600 CPU at 2.4 GHz and PC6400 memory at specification speed requires a CPU
: memory clock ratio of 266 MHz / 200 MHz = 4 : 3

E6600 CPU at 3.2 GHz and PC6400 memory at specification speed requires a CPU
: memory clock ratio of 333 MHz / 200 MHz = 5 : 3

(Since there is no CPU : memory clock ratio between 4 : 3 and 5 : 3 you must
use the 5 : 3 ratio for overclocking to 3.0 GHz)

Memory can also be overclocked. You may find that the PC6400 memory will
operate at with a clock speed of more than 200 MHz, and that you can
overclock the E6600 to more than 3.2 GHz with a CPU : memory clock ratio of
5 : 3 and a FSB clock of more than 333 MHz.

Phil Weldon

"Nick Le Lievre" <nicklelievre.DeleteThis@jerseymail.co.uk.invalid> wrote in message
news:4612673b$0$21944$834e42db@reader.greatnowhere.com...
| "Phil Weldon" <notdiscosed.DeleteThis@example.com> wrote in message
| news:7NQPh.17140$PL.3891@newsread4.news.pas.earthlink.net...
| >
| > If the motherboard uses DDR2 memory, to get a CPU clock rate for your
| > E6600
| > you either must have DDR2 memory that will work at PC10600 rates, OR you
| > must use a CPU:memory ratio that brings the memory clock down to
whatever
| > speed you CAN get out of your memory.
| >
|
| So if I want to get 333 * 9 out of my mates E6600 I would need PC10600
DDR2
| memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I use?
|
|
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

On Apr 3, 7:10 pm, "Phil Weldon" <notdisco... DeleteThis @example.com> wrote:
> 'Nick Le Lievre' wrote:
>
> | So if I want to get 333 * 9 out of my mates E6600 I would need PC10600
> DDR2
> | memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I use?
> _____
>
> 5 : 3
>
> Your friend's PC6400 DDR2 memory is specified to operate with a 200 MHz
> clock.
> He has an E6600 CPU that is specified to operate with a 266 MHz clock.
>
> E6600 CPU at 2.4 GHz and PC6400 memory at specification speed requires a CPU
> : memory clock ratio of 266 MHz / 200 MHz = 4 : 3
>
> E6600 CPU at 3.2 GHz and PC6400 memory at specification speed requires a CPU
> : memory clock ratio of 333 MHz / 200 MHz = 5 : 3
>
> (Since there is no CPU : memory clock ratio between 4 : 3 and 5 : 3 you must
> use the 5 : 3 ratio for overclocking to 3.0 GHz)
>
> Memory can also be overclocked. You may find that the PC6400 memory will
> operate at with a clock speed of more than 200 MHz, and that you can
> overclock the E6600 to more than 3.2 GHz with a CPU : memory clock ratio of
> 5 : 3 and a FSB clock of more than 333 MHz.
>
> Phil Weldon
>
> "Nick Le Lievre" <nicklelie... DeleteThis @jerseymail.co.uk.invalid> wrote in messagenews:4612673b$0$21944$834e42db@reader.greatnowhere.com...
> | "Phil Weldon" <notdisco... DeleteThis @example.com> wrote in message
> |news:7NQPh.17140$PL.3891@newsread4.news.pas.earthlink.net...
> | >
> | > If the motherboard uses DDR2 memory, to get a CPU clock rate for your
> | > E6600
> | > you either must have DDR2 memory that will work at PC10600 rates, OR you
> | > must use a CPU:memory ratio that brings the memory clock down to
> whatever
> | > speed you CAN get out of your memory.
> | >
> |
> | So if I want to get 333 * 9 out of my mates E6600 I would need PC10600
> DDR2
> | memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I use?
> |
> |

Phil, sorry to intervene but you seem to forget that for DDR2 memory
the bus clock is twice the mem clock. As a consequence, the clock you
must use to get PC6400 (DDR2 800) mem to stock speed is 400 MHz, not
200.
So, to have a 1:1 ratio with the E6600 at 3Ghz (333 MHz * 9) , you
only have to use DDR2 667 chips (PC5300 modules). No need to search
for PC10600 modules.
This is exactly what I am using in my PC now.
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

On Apr 19, 9:40 pm, "Phil Weldon" <not.disclo... RemoveThis @example.com> wrote:
> 'mcarleer' wrote:
>
> | Phil, sorry to intervene but you seem to forget that for DDR2 memory
> | the bus clock is twice the mem clock. As a consequence, the clock you
> | must use to get PC6400 (DDR2 800) mem to stock speed is 400 MHz, not
> | 200.
> | So, to have a 1:1 ratio with the E6600 at 3Ghz (333 MHz * 9) , you
> | only have to use DDR2 667 chips (PC5300 modules). No need to search
> | for PC10600 modules.
> | This is exactly what I am using in my PC now.
> _____
>
> Please DO intervene. It is this sort of 'peer review' that makes
> alt.comp.hardware.overclocking useful.
>
> Well, the conventional number usage is not very clear, but my understanding
> is that PC1066 / PC8500 memory is needed to use the same clock for memory
> and the CPU (a 1 : 1 ratio) with an E6600 at stock speed.
>
> The stock clock for the E6600 is 266 MHz, then the FSB is 4 X 266 MHz = 1066
> MHz. The E6600 CPU stock speed is 2.4 GHz (9 X 266 MHz = ~ 2.4 GHz.) If
> the memory cannot operate at a 266 MHz clock then the ratio must be changed
> to from 1 : 1. DDR2 PC6400 memory is also called PC800 (6400/8 = 800)
> memory; it is specified for a 200 MHz clock. DDR2 PC8500 memory is also
> called PC1066 (8500/8 = ~ 1066) memory; it is specified for a 266 MHz clock,
> the same as the stock clock speed for the E6600. For the original poster to
> use a 333 MHz clock speed for the CPU ( giving an overclock to 3.0 GHz) and
> for the memory, the memory would have to operate at the PC1333 (PC10600)
> level.
>
> PC6400 (PC800) is certified for a clock of 200 MHz to operate that
> memory,within specifications, with a CPU clock of 333 MHz would require the
> CPU clock : memory clock ratio to be 5:3.
>
> So, no matter the confused nomenclature, the fact is that PC 6400 (PC800)
> memory cannot operate within specs with a 333 MHz clock speed. Were the
> facts as you present them, there would hardly be a market for PC8500
> (PC1066) and PC10600 (PC1333) memory. I don't know what system you
> have )but if (assuming it uses an Intel CPU) the FrontSide Bus is 1066 MHz,
> then your CPU clock : memory clock ratio is NOT 1:1 unless you are
> overclocking that PC800 memory to PC1066 levels. For the original poster it
> is possible that he could overclock PC1066 (PC8500) memory to PC1333
> (PC10600) levels and use 333 MHz for the CPU and memory clocks. With PC6400
> (PC800) memory that is HIGHLY unlikely.
>
> Phil Weldon
>
> P.S. If you have used your real email identity for this post, be prepared
> for spam and possible maliciously infected email. Spammers regularly
> harvest email addresses from Usenet posts. Some Internet worms ('Swen' in
> particular) harvest email addresses from Usenet posts and use those
> addresses as 'To:' AND as bogus 'From:' fields. That is why I use
> 'not.disclo...@example.com'. Other posters just obfuscate the email
> identity by replacing the '@' with 'at'.
>
> <mcarl... RemoveThis @skynet.be> wrote in message
>
> news:1176994030.657415.186200@p77g2000hsh.googlegroups.com...
> | On Apr 3, 7:10 pm, "Phil Weldon" <notdisco... RemoveThis @example.com> wrote:
> | > 'Nick Le Lievre' wrote:
> | >
> | > | So if I want to get 333 * 9 out of my mates E6600 I would need PC10600
> | > DDR2
> | > | memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I
> use?
> | > _____
> | >
> | > 5 : 3
> | >
> | > Your friend's PC6400 DDR2 memory is specified to operate with a 200 MHz
> | > clock.
> | > He has an E6600 CPU that is specified to operate with a 266 MHz clock.
> | >
> | > E6600 CPU at 2.4 GHz and PC6400 memory at specification speed requires a
> CPU
> | > : memory clock ratio of 266 MHz / 200 MHz = 4 : 3
> | >
> | > E6600 CPU at 3.2 GHz and PC6400 memory at specification speed requires a
> CPU
> | > : memory clock ratio of 333 MHz / 200 MHz = 5 : 3
> | >
> | > (Since there is no CPU : memory clock ratio between 4 : 3 and 5 : 3 you
> must
> | > use the 5 : 3 ratio for overclocking to 3.0 GHz)
> | >
> | > Memory can also be overclocked. You may find that the PC6400 memory
> will
> | > operate at with a clock speed of more than 200 MHz, and that you can
> | > overclock the E6600 to more than 3.2 GHz with a CPU : memory clock ratio
> of
> | > 5 : 3 and a FSB clock of more than 333 MHz.
> | >
> | > Phil Weldon
> | >
> | > "Nick Le Lievre" <nicklelie... RemoveThis @jerseymail.co.uk.invalid> wrote in
> messagenews:4612673b$0$21944$834e42db@reader.greatnowhere.com...
> | > | "Phil Weldon" <notdisco... RemoveThis @example.com> wrote in message
> | > |news:7NQPh.17140$PL.3891@newsread4.news.pas.earthlink.net...
> | > | >
> | > | > If the motherboard uses DDR2 memory, to get a CPU clock rate for
> your
> | > | > E6600
> | > | > you either must have DDR2 memory that will work at PC10600 rates, OR
> you
> | > | > must use a CPU:memory ratio that brings the memory clock down to
> | > whatever
> | > | > speed you CAN get out of your memory.
> | > | >
> | > |
> | > | So if I want to get 333 * 9 out of my mates E6600 I would need PC10600
> | > DDR2
> | > | memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I
> use?
> | > |
> | > |
> |
> | Phil, sorry to intervene but you seem to forget that for DDR2 memory
> | the bus clock is twice the mem clock. As a consequence, the clock you
> | must use to get PC6400 (DDR2 800) mem to stock speed is 400 MHz, not
> | 200.
> | So, to have a 1:1 ratio with the E6600 at 3Ghz (333 MHz * 9) , you
> | only have to use DDR2 667 chips (PC5300 modules). No need to search
> | for PC10600 modules.
> | This is exactly what I am using in my PC now.
> |

Where you make an error is in using the mem internal memory clock to
do your calculations. For DDR2 memory, the bus clock has to be twice
the mem clock. That's how DDR2 communicates 4 data per mem clock
pulse.
Your calculations are correct for DDR (not 2) mem however.
So, a DDR2 800 mem (PC6400) uses an internal clock of 200 MHz, but the
bus to the mem has to be at 400 MHz to have stock speed.
In my case a C2D E6600 (oveclocked at 333 MHz x 9 = 3 GHz) on a P5W DH
is happily running with 2 sticks of DDR2 667 (PC5300) at a 1:1 ratio.
As reported by both the BIOS and by CPU-Z.
And the very high speed mem modules (PC8500 etc) are, I think, only
intended for very agressive overclocking fans up to now.

PS: I know about the e-mail problem, however google does not allow me
to use a fake address of any kind. Or maybe you can tell me howto?
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

'mcarleer' wrote:
| Phil, sorry to intervene but you seem to forget that for DDR2 memory
| the bus clock is twice the mem clock. As a consequence, the clock you
| must use to get PC6400 (DDR2 800) mem to stock speed is 400 MHz, not
| 200.
| So, to have a 1:1 ratio with the E6600 at 3Ghz (333 MHz * 9) , you
| only have to use DDR2 667 chips (PC5300 modules). No need to search
| for PC10600 modules.
| This is exactly what I am using in my PC now.
_____

Please DO intervene. It is this sort of 'peer review' that makes
alt.comp.hardware.overclocking useful.

Well, the conventional number usage is not very clear, but my understanding
is that PC1066 / PC8500 memory is needed to use the same clock for memory
and the CPU (a 1 : 1 ratio) with an E6600 at stock speed.

The stock clock for the E6600 is 266 MHz, then the FSB is 4 X 266 MHz = 1066
MHz. The E6600 CPU stock speed is 2.4 GHz (9 X 266 MHz = ~ 2.4 GHz.) If
the memory cannot operate at a 266 MHz clock then the ratio must be changed
to from 1 : 1. DDR2 PC6400 memory is also called PC800 (6400/8 = 800)
memory; it is specified for a 200 MHz clock. DDR2 PC8500 memory is also
called PC1066 (8500/8 = ~ 1066) memory; it is specified for a 266 MHz clock,
the same as the stock clock speed for the E6600. For the original poster to
use a 333 MHz clock speed for the CPU ( giving an overclock to 3.0 GHz) and
for the memory, the memory would have to operate at the PC1333 (PC10600)
level.

PC6400 (PC800) is certified for a clock of 200 MHz to operate that
memory,within specifications, with a CPU clock of 333 MHz would require the
CPU clock : memory clock ratio to be 5:3.

So, no matter the confused nomenclature, the fact is that PC 6400 (PC800)
memory cannot operate within specs with a 333 MHz clock speed. Were the
facts as you present them, there would hardly be a market for PC8500
(PC1066) and PC10600 (PC1333) memory. I don't know what system you
have )but if (assuming it uses an Intel CPU) the FrontSide Bus is 1066 MHz,
then your CPU clock : memory clock ratio is NOT 1:1 unless you are
overclocking that PC800 memory to PC1066 levels. For the original poster it
is possible that he could overclock PC1066 (PC8500) memory to PC1333
(PC10600) levels and use 333 MHz for the CPU and memory clocks. With PC6400
(PC800) memory that is HIGHLY unlikely.

Phil Weldon

P.S. If you have used your real email identity for this post, be prepared
for spam and possible maliciously infected email. Spammers regularly
harvest email addresses from Usenet posts. Some Internet worms ('Swen' in
particular) harvest email addresses from Usenet posts and use those
addresses as 'To:' AND as bogus 'From:' fields. That is why I use
'not.disclosed@example.com'. Other posters just obfuscate the email
identity by replacing the '@' with 'at'.





<mcarleer DeleteThis @skynet.be> wrote in message
news:1176994030.657415.186200@p77g2000hsh.googlegroups.com...
| On Apr 3, 7:10 pm, "Phil Weldon" <notdisco... DeleteThis @example.com> wrote:
| > 'Nick Le Lievre' wrote:
| >
| > | So if I want to get 333 * 9 out of my mates E6600 I would need PC10600
| > DDR2
| > | memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I
use?
| > _____
| >
| > 5 : 3
| >
| > Your friend's PC6400 DDR2 memory is specified to operate with a 200 MHz
| > clock.
| > He has an E6600 CPU that is specified to operate with a 266 MHz clock.
| >
| > E6600 CPU at 2.4 GHz and PC6400 memory at specification speed requires a
CPU
| > : memory clock ratio of 266 MHz / 200 MHz = 4 : 3
| >
| > E6600 CPU at 3.2 GHz and PC6400 memory at specification speed requires a
CPU
| > : memory clock ratio of 333 MHz / 200 MHz = 5 : 3
| >
| > (Since there is no CPU : memory clock ratio between 4 : 3 and 5 : 3 you
must
| > use the 5 : 3 ratio for overclocking to 3.0 GHz)
| >
| > Memory can also be overclocked. You may find that the PC6400 memory
will
| > operate at with a clock speed of more than 200 MHz, and that you can
| > overclock the E6600 to more than 3.2 GHz with a CPU : memory clock ratio
of
| > 5 : 3 and a FSB clock of more than 333 MHz.
| >
| > Phil Weldon
| >
| > "Nick Le Lievre" <nicklelie... DeleteThis @jerseymail.co.uk.invalid> wrote in
messagenews:4612673b$0$21944$834e42db@reader.greatnowhere.com...
| > | "Phil Weldon" <notdisco... DeleteThis @example.com> wrote in message
| > |news:7NQPh.17140$PL.3891@newsread4.news.pas.earthlink.net...
| > | >
| > | > If the motherboard uses DDR2 memory, to get a CPU clock rate for
your
| > | > E6600
| > | > you either must have DDR2 memory that will work at PC10600 rates, OR
you
| > | > must use a CPU:memory ratio that brings the memory clock down to
| > whatever
| > | > speed you CAN get out of your memory.
| > | >
| > |
| > | So if I want to get 333 * 9 out of my mates E6600 I would need PC10600
| > DDR2
| > | memory... he has DDR2 6400. Therefore what CPU:Memory ratio should I
use?
| > |
| > |
|
| Phil, sorry to intervene but you seem to forget that for DDR2 memory
| the bus clock is twice the mem clock. As a consequence, the clock you
| must use to get PC6400 (DDR2 800) mem to stock speed is 400 MHz, not
| 200.
| So, to have a 1:1 ratio with the E6600 at 3Ghz (333 MHz * 9) , you
| only have to use DDR2 667 chips (PC5300 modules). No need to search
| for PC10600 modules.
| This is exactly what I am using in my PC now.
|
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

Never mind, posting from newsgroup now.
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

'mcarleer' wrote, in part:
| Where you make an error is in using the mem internal memory clock to
| do your calculations. For DDR2 memory, the bus clock has to be twice
| the mem clock. That's how DDR2 communicates 4 data per mem clock
| pulse.
| Your calculations are correct for DDR (not 2) mem however.
| So, a DDR2 800 mem (PC6400) uses an internal clock of 200 MHz, but the
| bus to the mem has to be at 400 MHz to have stock speed.
| In my case a C2D E6600 (oveclocked at 333 MHz x 9 = 3 GHz) on a P5W DH
| is happily running with 2 sticks of DDR2 667 (PC5300) at a 1:1 ratio.
| As reported by both the BIOS and by CPU-Z.
| And the very high speed mem modules (PC8500 etc) are, I think, only
| intended for very agressive overclocking fans up to now.
_____

Regardless of the numbers and divisors used, the case remains that DDR2
PC6400 memory cannot use a 1:1 CPU clock : memory clock ratio if the FSB is
1066 (unless it is overclocked beyond manufacturer specifications It can
run at a 1:1 ratio with an FSB of 800 MHz. DDR2 PC1066 CAN run at specified
speed with an FSB of 1066 MHz and a 1:1 CPU clock : memory clock ratio. The
double clocked DDR2 memory will work off the same clock as the CPU; 266 MHz
in the case of a 1066 MHz FSB. THe FSB speed will be the same as the memory
speed.

There is probably a much more clear way of stating this, but that's the best
O cam do from my present understanding.

Phil Weldon

<mcarleer DeleteThis @skynet.be> wrote in message
news:1177016868.159431.47610@n76g2000hsh.googlegroups.com...
..
..|
| Where you make an error is in using the mem internal memory clock to
| do your calculations. For DDR2 memory, the bus clock has to be twice
| the mem clock. That's how DDR2 communicates 4 data per mem clock
| pulse.
| Your calculations are correct for DDR (not 2) mem however.
| So, a DDR2 800 mem (PC6400) uses an internal clock of 200 MHz, but the
| bus to the mem has to be at 400 MHz to have stock speed.
| In my case a C2D E6600 (oveclocked at 333 MHz x 9 = 3 GHz) on a P5W DH
| is happily running with 2 sticks of DDR2 667 (PC5300) at a 1:1 ratio.
| As reported by both the BIOS and by CPU-Z.
| And the very high speed mem modules (PC8500 etc) are, I think, only
| intended for very agressive overclocking fans up to now.
|
| PS: I know about the e-mail problem, however google does not allow me
| to use a fake address of any kind. Or maybe you can tell me howto?
|
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

I agree totally that PC6400 modules cannot run at a 1:1 ratio with an FSB of
1066 MHz.
A DDR2 mem module running at 266MHz bus speed (133 MHz internal), however,
is DDR2 533 (PC4200). Not DDR2 1066. That is the definition.
A P5W DH mobo with a C2D E6600 (266 MHz clock, 9 x multiplier) will run by
default mem modules as if they were DDR2 533 even if they are DDR2 800, DDR2
1066 or whatever. Just to stick to the 1:1 ratio.
With an E6600 CPU at stock speed (266 MHz x 9 = 2.4 GHz), using mems faster
than DDR2 533 (PC4200) with ratios other than 1:1 to run the mem at their
stock speed does not improve the data bandwidth at all. It even, in some
instances, lowers the bandwidth. Simply because the CPU, anyway, cannot send
or receive data at a higher pace than its running speed. This has been
proven by very thorough benchmarks available on the net.
Where it becomes interesting to use higher speed memories is when
overclocking the CPU. For example, I am overclocking my E6600 at 333 MHz x 9
= 3.0 GHz. To retain the 1:1 ratio, I have to use DDR2 667 (PC5300) modules.
On the other hand, speedier mems can run at a DDR2 533 clock speed with far
lower latencies.
If using a DDR2 533 at 266 MHz bus speed (133 MHz internal), you will
probably have to use 5-5-5-15 timings, whereas using DDR2 1066 at the same
266 MHz bus speed, you will probably be able to use 3-3-3-12, or even
2-2-2-12 timings. And this brings a substantial data bandwidth enhancement.
Remember: a DDR2 XXX (PCXXX * runs at an internal clock frequency of
XXX/4, but communicates with the bus at XXX/2. And this XXX/2 has to be the
clock frequency fed to the CPU to have a 1:1 ratio.

"Phil Weldon" <not.disclosed DeleteThis @example.com> wrote in message
news:t7ZVh.3366$j63.2913@newsread2.news.pas.earthlink.net...
> 'mcarleer' wrote, in part:
> | Where you make an error is in using the mem internal memory clock to
> | do your calculations. For DDR2 memory, the bus clock has to be twice
> | the mem clock. That's how DDR2 communicates 4 data per mem clock
> | pulse.
> | Your calculations are correct for DDR (not 2) mem however.
> | So, a DDR2 800 mem (PC6400) uses an internal clock of 200 MHz, but the
> | bus to the mem has to be at 400 MHz to have stock speed.
> | In my case a C2D E6600 (oveclocked at 333 MHz x 9 = 3 GHz) on a P5W DH
> | is happily running with 2 sticks of DDR2 667 (PC5300) at a 1:1 ratio.
> | As reported by both the BIOS and by CPU-Z.
> | And the very high speed mem modules (PC8500 etc) are, I think, only
> | intended for very agressive overclocking fans up to now.
> _____
>
> Regardless of the numbers and divisors used, the case remains that DDR2
> PC6400 memory cannot use a 1:1 CPU clock : memory clock ratio if the FSB
is
> 1066 (unless it is overclocked beyond manufacturer specifications It can
> run at a 1:1 ratio with an FSB of 800 MHz. DDR2 PC1066 CAN run at
specified
> speed with an FSB of 1066 MHz and a 1:1 CPU clock : memory clock ratio.
The
> double clocked DDR2 memory will work off the same clock as the CPU; 266
MHz
> in the case of a 1066 MHz FSB. THe FSB speed will be the same as the
memory
> speed.
>
> There is probably a much more clear way of stating this, but that's the
best
> O cam do from my present understanding.
>
> Phil Weldon
>
> <mcarleer DeleteThis @skynet.be> wrote in message
> news:1177016868.159431.47610@n76g2000hsh.googlegroups.com...
> .
> .|
> | Where you make an error is in using the mem internal memory clock to
> | do your calculations. For DDR2 memory, the bus clock has to be twice
> | the mem clock. That's how DDR2 communicates 4 data per mem clock
> | pulse.
> | Your calculations are correct for DDR (not 2) mem however.
> | So, a DDR2 800 mem (PC6400) uses an internal clock of 200 MHz, but the
> | bus to the mem has to be at 400 MHz to have stock speed.
> | In my case a C2D E6600 (oveclocked at 333 MHz x 9 = 3 GHz) on a P5W DH
> | is happily running with 2 sticks of DDR2 667 (PC5300) at a 1:1 ratio.
> | As reported by both the BIOS and by CPU-Z.
> | And the very high speed mem modules (PC8500 etc) are, I think, only
> | intended for very agressive overclocking fans up to now.
> |
> | PS: I know about the e-mail problem, however google does not allow me
> | to use a fake address of any kind. Or maybe you can tell me howto?
> |
>
>
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

"Phil Weldon" <not.disclosed DeleteThis @example.com> wrote in message
news:t7ZVh.3366$j63.2913@newsread2.news.pas.earthlink.net...
> 'mcarleer' wrote, in part:
> | Where you make an error is in using the mem internal memory clock to
> | do your calculations. For DDR2 memory, the bus clock has to be twice
> | the mem clock. That's how DDR2 communicates 4 data per mem clock
> | pulse.
> | Your calculations are correct for DDR (not 2) mem however.
> | So, a DDR2 800 mem (PC6400) uses an internal clock of 200 MHz, but the
> | bus to the mem has to be at 400 MHz to have stock speed.
> | In my case a C2D E6600 (oveclocked at 333 MHz x 9 = 3 GHz) on a P5W DH
> | is happily running with 2 sticks of DDR2 667 (PC5300) at a 1:1 ratio.
> | As reported by both the BIOS and by CPU-Z.
> | And the very high speed mem modules (PC8500 etc) are, I think, only
> | intended for very agressive overclocking fans up to now.
> _____
>
> Regardless of the numbers and divisors used, the case remains that DDR2
> PC6400 memory cannot use a 1:1 CPU clock : memory clock ratio if the FSB
> is
> 1066 (unless it is overclocked beyond manufacturer specifications It can
> run at a 1:1 ratio with an FSB of 800 MHz. DDR2 PC1066 CAN run at
> specified
> speed with an FSB of 1066 MHz and a 1:1 CPU clock : memory clock ratio.
> The
> double clocked DDR2 memory will work off the same clock as the CPU; 266
> MHz
> in the case of a 1066 MHz FSB. THe FSB speed will be the same as the
> memory
> speed.
>
> There is probably a much more clear way of stating this, but that's the
> best
> O cam do from my present understanding.
>
> Phil Weldon
>
The way I understand it with today's MB bios, is that since the memory
and CPU run seperate of each other the bios will read the spd from the
memory and set it to default. So if you are running DDR2 800 along with an
E6600 the memory will default to 800 which will not affect the CPU speed,
but will affect memory performance a bit. Most, but not all memory will have
some OC overhead. That is why I went with faster rated memory (PC1066) for
the E6600 for just a little more overhead to run at 1:1.......I hope....

Ed
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

Well, this is apparently not how the Asus P5W DH (AMIBIOS 1407 or 1901)
behaves. It seems to always favor the 1:1 ratio between CPU and mem clock
when set in Auto mode, which comes as default. But you can change it
manually in the BIOS.
And if you look at the spd data of the Corsair DDR2 667 value select sticks
which I use, it gives the timings for 667, 533 and 400. At least, that's
what CPU-Z mentions.
As I mentionned earlier, using higher speed DDR2 enables you either to
overclock the CPU and still stay with the 1:1 ratio, or reduce substantially
the latency timings if you run the mem at a lower than specified speed. Or a
combination of both.

"Ed Medlin" <ed RemoveThis @edmedlin.com> wrote in message
news:1D2Wh.1370$H_.292@newssvr21.news.prodigy.net...
>
> "Phil Weldon" <not.disclosed RemoveThis @example.com> wrote in message
> news:t7ZVh.3366$j63.2913@newsread2.news.pas.earthlink.net...
> > 'mcarleer' wrote, in part:
> > | Where you make an error is in using the mem internal memory clock to
> > | do your calculations. For DDR2 memory, the bus clock has to be twice
> > | the mem clock. That's how DDR2 communicates 4 data per mem clock
> > | pulse.
> > | Your calculations are correct for DDR (not 2) mem however.
> > | So, a DDR2 800 mem (PC6400) uses an internal clock of 200 MHz, but the
> > | bus to the mem has to be at 400 MHz to have stock speed.
> > | In my case a C2D E6600 (oveclocked at 333 MHz x 9 = 3 GHz) on a P5W DH
> > | is happily running with 2 sticks of DDR2 667 (PC5300) at a 1:1 ratio.
> > | As reported by both the BIOS and by CPU-Z.
> > | And the very high speed mem modules (PC8500 etc) are, I think, only
> > | intended for very agressive overclocking fans up to now.
> > _____
> >
> > Regardless of the numbers and divisors used, the case remains that DDR2
> > PC6400 memory cannot use a 1:1 CPU clock : memory clock ratio if the FSB
> > is
> > 1066 (unless it is overclocked beyond manufacturer specifications It
can
> > run at a 1:1 ratio with an FSB of 800 MHz. DDR2 PC1066 CAN run at
> > specified
> > speed with an FSB of 1066 MHz and a 1:1 CPU clock : memory clock ratio.
> > The
> > double clocked DDR2 memory will work off the same clock as the CPU; 266
> > MHz
> > in the case of a 1066 MHz FSB. THe FSB speed will be the same as the
> > memory
> > speed.
> >
> > There is probably a much more clear way of stating this, but that's the
> > best
> > O cam do from my present understanding.
> >
> > Phil Weldon
> >
> The way I understand it with today's MB bios, is that since the memory
> and CPU run seperate of each other the bios will read the spd from the
> memory and set it to default. So if you are running DDR2 800 along with an
> E6600 the memory will default to 800 which will not affect the CPU speed,
> but will affect memory performance a bit. Most, but not all memory will
have
> some OC overhead. That is why I went with faster rated memory (PC1066) for
> the E6600 for just a little more overhead to run at 1:1.......I
hope....
>
> Ed
>
>
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe 

Ed Medlin wrote:
> Most, but not all memory will have some OC overhead. That is why
> I went with faster rated memory (PC1066) for the E6600 for just a
> little more overhead to run at 1:1.......I hope....

Yup, I'd say you're pretty much covered-- you might even have to
drop the multiplier a tad!
 >> Stay informed about: Overclocking E6600 on Asus P5W DH Deluxe