Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
"Paul" <nospam@needed.com> wrote in message
news:nospam-1508051558300001@192.168.1.178...
> In article <f72dnZ2dnZ2-mLuBnZ2dne52nd6dnZ2dRVn-zp2dnZ0@rogers.com>,
> "Steve lovenjak" <stevelovenjak@rogers.com> wrote:
>
>> I have a stick of 512mb ram pc3200 ,installed on this board ,but strangly
>> enough ,my ram only works in memory moduale 3 (blue strip) ..
>>
>> when i try to install it in bank one or 2 my system wont boot ????.only
>> boots in bank 3 and 4 ...could this be because of quality of ram or that
>> is
>> double sided ..thnx
>
> This is a feature of your processor. Prior to Venice Revision E
> processors, the B1 and B2 slots are on the "primary" 64 bit bus.
> The A1 and A2 slots are only to be used when running in dual
> channel mode. If you have two matched sticks, you could place
> them in A1 and B1, for example. If the sticks do not match,
> install them in B1 and B2, which is the "single channel" bus.
> Venice corrects this fixation with the B bus, which the earlier
> processors had.
>
> Before Venice (like Clawhammer, Newcastle, Winchester)
>
> 1 stick - place in B1 or B2.
> 2 sticks - place in B1 and B2, for single channel mode.
> If sticks are matched, place in A1&B1 or try A2&B2
> 3 sticks - invalid configuration
> 4 sticks - must be two matched pairs. If the sticks do not
> match, some DIMMs will be ignored, or the computer
> will not post. Many users have trouble, even when
> they follow the rules to the letter. Set memory
> speed to DDR333 first, and then install the second
> pair. It might POST for you.
>
> Venice or later:
>
> 1,2,3, or 4 sticks work. A and B slots have equal qualities
> (no more "B is king").
> If sticks do not match, processor memory controller runs in
> single channel mode.
> If 2 or 4 sticks are installed in matched pairs, in slot
> pairs A1&B1 and A2&B2, the BIOS should use dual channel mode.
> With 3 sticks, only single channel mode is possible.
>
> The Asus BIOS still does not work properly with respect to
> all of these options. You may get a surprise, depending on
> what mix of DIMMs you try. Consult this document, as it
> explains the memory controller from AMD's perspective -
> this is full of technical jargon, and is hard to read.
>
>
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26094.PDF
>
> Having to explain all this stuff to customers, must drive
> Asus phone support crazy
>
> Paul
To be fair to the OP the manual for this motherboard does not make it that
clear that Slot 3 must be populated. It caught me out!
Andy
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