Possible problem adding 2GB RAM to an ASUS A8N-SLI Premium motherboard

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Hopefully this can be answered by someone that already has the motherboard,
or knows about it.

I currently have an ASUS A8N-SLI Premium motherboard with 1GB of DDR ram,
using Corsair TWINX1024-3200C2PT matched memory (2 off 512MB modules). These
are installed in DIMM A1 and A2 as a dual channel configuration.

I wanted to add an extra 2GB of RAM - Corsair TWINX2048-3200C2PT - as it has
the same CAS. However, according to my ASUS handbook, using this RAM, the
motherboard does not "support 4 modules inserted into the blue and black
slots as two pairs of dual channel memory configuration", but it does
support one pair of modules as a dual channel configuration.

I therefore have the following questions:

1) Does this mean that I cannot actually add two extra RAM DIMMs?
2) Does it mean that I can add them, but they will not work as well as they
could because they cannot be used as 2 dual channels?
3) Can I actually mix 1GB in one channel and 2GB in another, or do I have to
get an extra 1GB instead?
4) If I wanted to add the 2GB, would it be better to add two lots of (512MB
+ 1GB) modules in each channel? Obviously they would not be matched any

As you can tell, I am not exactly sure what I can and cannot do, so any help
is greatly appreciated.



Re: Possible problem adding 2GB RAM to an ASUS A8N-SLI Premium motherboard

Martin C wrote:
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When you read an Asus table, what strikes you about their test results ?
Take a table entry, where column "A" is missing a tick box. What they're
telling you, is they tested with a single stick, and it wouldn't work.
But when they installed two or four sticks, oh, it worked. What it means
is, you cannot trust that table of test results, further than you can
throw it.

You put a matched pair in A1,B1 (same color as each other). You put a
different matched pair in A2,B2 (same color as each other). The
manual says "DIMM_A1+DIMM_A2=DIMM_B1+DIMM_B2", and in your case,
each channel will have a total of 1.5GB of memory. The total memory
will be 3GB, minus any address space needed for system busses (assuming
a 32 bit OS).

1) Yes, you can add RAM. Two dissimilar, matched pairs should work nicely.
2) Four double sided sticks is more electrical load than two
    double sided sticks. If the BIOS is set to "Auto" for memory,
    it will adjust the memory clock from a DDR400 rate to DDR333.
    That compensates for the extra stress. The memory should still
    work fine. (The compensation factor, in fact, is predicted by
    AMD and is in their BIOS writers guide. So Asus didn't make this
    up themselves. And you can tweak the memory yourself, and trade
    performance versus stability. Using memtest86+ and Prime95, you
    can test for stability, and use whatever settings are still stable.
    AMD's guidelines are conservative, and intended for fully automatic
    settings with good stability.)
3) You put 1.5GB in each channel, for a total of 3GB.
4) Match A1 to B1 (512MB each say). Match A2 to B2 (1GB each). A1+A2=1.5GB
    B1+B2=1.5GB . Dual channel operation is the result.

If you have a Revision E processor or later, in fact you can do just
about anything. Revision E allows mismatched memory, like 256+512+1024,
a total of three sticks to be installed. D0 or CG would not like that,
but E3 or E6 or another E would be fine with it. Processors prior to E,
like matched pairs when memory is present in both channels. And my
description above, has been tailored to suit *all* the processors.
But if you wanted to run a goofy set of three sticks, you can do it
if the processor is Revision E or later. The automatic setting
would be DDR333 for that, due to the channel with the two sticks in


Re: Possible problem adding 2GB RAM to an ASUS A8N-SLI Premium motherboard


Thanks very much for the comprehensive reply.

I was not sure what a Revision E processor was or if I had one.
I have an AMD Athlon 64 3500 Venice single core CPU if that helps.


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Re: Possible problem adding 2GB RAM to an ASUS A8N-SLI Premium motherboard

Martin C wrote:
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This is a 3500+ E3 S939.

Processors are identified by their OPN. The ADA3500DAA4BP
number is for an OEM (no cooler) and the PIB or processor
in box (likely includes cooler) is ADA3500BPBOX. Some
vendors will even show the code, in an advertisement, so
you know what you're getting.

You can look up more of them here - http://products.amd.com /

In general, the AMD site and documentation, leave a bit to be
desired. There are times, when you'll find a discussion
about some processor, and when you use that site to look it
up, it isn't listed. Sometimes I have to resort to using
web.archive.org, to find stuff on older versions of the
web site.


Re: Possible problem adding 2GB RAM to an ASUS A8N-SLI Premium motherboard

CPU-Z will tell you that...

A lot learned from these newsgroups
Helsinki, FINLAND
(translations from/to FI not always accurate

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