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Tom Del Rosso

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Since: Dec 18, 2005
Posts: 12



(Msg. 1) Posted: Fri Oct 19, 2007 1:38 pm
Post subject: A8N-SLI Premium RAM limit
Archived from groups: alt>comp>periphs>mainboard>asus (more info?)

This is what kinston says about the RAM limit.

2 GB using 400MHz DDR modules
4 GB using 333MHz or 266MHz DDR modules

I have a 4400+ with a 200MHz FSB so I'm only looking to add 400MHz RAM, but
what is Kingston saying here? Asus specs don't mention this. But why would
Kingston not make RAM that can reach the limit?


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Bob Knowlden

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Since: Nov 15, 2003
Posts: 231



(Msg. 2) Posted: Fri Oct 19, 2007 9:25 pm
Post subject: Re: A8N-SLI Premium RAM limit [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

http://support.asus.com/faq/faq.aspx?no=FFC7FB3A-68C0-6372-EE3B-D9013E...5D3&SLa

If you populate all 4 DIMM sockets, the board downclocks to 333 MHz by
default. I guess that Kingston didn't want to launch into a discussion of
this. The work-around is to manually set the memory timings back to DDR400.
(You may need to set the command rate to 2T, rather than the faster 1T.)

The web page above has a link to the support page for the mainboard, which
in term has a link to the memory QVL (qualified vendors list). That list
will tell what modules are verified to work if all 4 sockets are used, but
it won't say which ones can be clocked back to 400 MHz.

If you can add RAM that can tolerate an elevated voltage, you may do better
in getting back to 400 MHz. I have limited experience with that, but I've
had good luck with Corsair memory.


Return address scrambled. Replace nkbob with bobkn.

"Tom Del Rosso" <td_01 DeleteThis @att.net.invalid> wrote in message
news:A06Si.293$582.119@newsfe12.lga...
> This is what kinston says about the RAM limit.
>
> 2 GB using 400MHz DDR modules
> 4 GB using 333MHz or 266MHz DDR modules
>
> I have a 4400+ with a 200MHz FSB so I'm only looking to add 400MHz RAM,
> but
> what is Kingston saying here? Asus specs don't mention this. But why
> would
> Kingston not make RAM that can reach the limit?
>
>
> --
>
> Reply in group, but if emailing add another
> zero, and remove the last word.
>
>

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Tom Del Rosso

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Since: Dec 18, 2005
Posts: 12



(Msg. 3) Posted: Sat Oct 20, 2007 12:24 am
Post subject: Re: A8N-SLI Premium RAM limit [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"Bob Knowlden" <nkbob RemoveThis @comcast.net> wrote in message
news:0pKdnVQ1mfyWxITanZ2dnUVZ_hynnZ2d@comcast.com
>
http://support.asus.com/faq/faq.aspx?no=FFC7FB3A-68C0-6372-EE3B-D9013E...5D3&SLa
>
> If you populate all 4 DIMM sockets, the board downclocks to 333 MHz by
> default.

[snip]

> If you can add RAM that can tolerate an elevated voltage, you may do
> better in getting back to 400 MHz. I have limited experience with
> that, but I've had good luck with Corsair memory.

Thanks a lot. Until today I didn't realize clock loading was a problem with
boards that don't take buffered RAM. I assumed if they don't take it then
they must not need it.

I am skeptical about raising the RAM supply voltage though, since that
wouldn't change the amplitude of the clock signal.

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