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ASUS A8N-SLI Premium


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I'm building a new system listed below:

ASUS A8N-SLI Premium

AMD64 3700

2x TwinX CMX3200LLPT-512 XMS3205v1.2

eVGA 7800 GT

WD 120

Antec TruePower2 550


I cannot get the system to post when ANY memory is in one of the "B" slots. I can put one stick in either or both "A" slots, but no combination will work in a "B" slot. I'm trying to figure out if this is a compatability issue with the XMS memory or if I have a bad MoBo.


I've played around with memory timings, trying to loosen them up some, but frankly don't know what I'm doing. I've bumped DRAM voltage up to 2.8 in case the B slots needed a little more juice, but all to no avail.


From all I've read, this memory should be compatible. But I do see one note in the fine print of the MoBo manual that says "Due to CPU limitation, DIMM modules with 128 Mb memory chips or double-sided x16 chips are not supported in this motherboard."


I did see that someone else reported a similary issue on this site, but it appeared that he couldn't get A1+B1 to work together. I can't even get B1 or B1+B2 to work together although A1, A2, and A1+A2 work together. So I'm not sure it is the same problem.


So, any idea if this is a memory compatibility issue? Any suggestions on what I should do next?



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One more piece of data. Using the Central Brain Identifier, I found out that my CPU is rev SH-E4. As you point out in another thread, this rev is not listed on ASUS's list of compatible CPUs!


Think that might be it? Sure seems fishy since I can't read either B slot. But the computer otherwise runs just fine. It passed a burn in with both A slots filled, runs games without a hitch, hasn't had any flakiness. It just can't do dual-channel.


So now I'm totally confused. Is it memory compatibility, faulty motherboard or CPU compatibility?

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I wasn't complaining, sorry if it came across that way. I just figured no one knew the answer, which is no sweat. I talked to ASUS a few minutes ago. They really believe it is a bad memory controller, not incompatible memory. The most likely culprit is the E4 revision on the San Diego chip, so I'm RMAing it. I just don't know how to ensure I get the right revision on a replacement!


The ASUS guy didn't think it sounded like incompatible memory since it works fine in both A channel slots. Makes sense, I guess :eyebuldge


I'd still like to know what the RAMGuy thinks about the compatibility question of the 3200LL, since I'd hate to RMA the processor only to find out I was wrong!


Thanks :)

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  • Corsair Employees
The modules you have are compatible with your motherboard. Please set the Dim Voltage to 2.7X volts and then set the timings manually to the tested settings for the specific module you have, and then test the module/modules one at a time with www.memtest.org! If both modules work fine individually, then it suggests other problems.
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