On Fri, 10 Oct 2003 18:22:04 +0100, CW wrote:
> I recently had the chance of a mini upgrade from an Athlon 1.0 CPU to an
> Athlon M4 1.4 266MHz processor. However when I try to change the FSB speed
> in the bios the highest I can get is 224MHz giving me a CPU speed of only
> 1.18GHz. If I try to change to 266MHz(133x2) which is the next step up in
> the bios my system locks and the only way out is to short the CMOS on the
> motherboard jumpers and re-start. I am using a Jetway 8363-686A motherboard
> which supposedly supports an FSB maximum of 266MHz. I am no expert and I am
> wondering if I am missing something obvious.
> Can anyone help?
Before any of this will make sense, you need to understand that the FSB
speed is a real 133MHz, not a bogus 266MHz. The KT133A chipset in your
board will officially support a 133MHz FSB and no higher, although
unofficially, it will go higher. The cpu speed is determined by multipying
the multiplier times the real FSB speed. So 10.5x133.34 (nominal)=
`1400MHz cpu speed. On the KT7(A) chipset, the memory bus also follows the
FSB (Hostclock setting in bios), so if your ram can't support a FSB speed
of 133MHz, then you're sol and will have to use a lower setting or get
faster ram. I use PC150 server grade for my old KT7 board. So if I get
this right, you're saying if you set your FSB over 112MHz, your system
won't boot. 1180/112=`10.5, so the multiplier is correct. You didn't
mention vcore, so check it and set it to the cpu default. also check and
make sure your ram is PC133, and not PC100. Assuming that the cpu is
unlocked try setting 12.5x112 and see what you get. That should also be
1400MHz. If that works, then you know you probably have ram problems,
although power may be a factor also.
--
Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB)
<a style='text-decoration: underline;' href="http://mysite.verizon.net/res0exft/cpu.html" target="_blank">http://mysite.verizon.net/res0exft/cpu.html</a><!-- ~MESSAGE_AFTER~ -->
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