Mixing CMX512-3200XLPT and CMX512-3200C2PT

[spikeh]

I recently purchased two sticks of CMX512-3200C2PT, to go into a system with two sticks of CMX512-3200XLPT in a ASUS A8N-SLI Premium motherboard. Now, before buying I had checked to make sure they all have a CAS# latency of 2.

 

But, I just installed the RAM and they are being forced to run at 133 MHz rather than 200 MHz. Checked in CPU-Z and it's reporting the CMX512-3200C2PT sticks to have timings of 3-3-3-8 at 200 MHz, which isn't what was advertised.

 

Now, what can I do to resolve the situation here? Can I somehow make the CMX512-3200C2PT modules run at 200 MHz with a CAS# latency of 2, or am I going to have to try and get these RAM refunded since it's incompatible.

[RAM GUY]

All of the modules would need to be exactly matched with this MB, but you can try and manually set the frequency to DDR333 at Cas 2.5-3-3-7 at 2.8 Volts and then test the system with http://www.memtest.org but you need to Disable legacy USB int he bios when you run any memory test with this MB.

[spikeh]

Here are the results from memtest86+ v1.65:

 

Legacy USB disabled

400 MHz with timings of 2.5-3-3-7

 

WallTime 16:00:00

MemMap e820-Std

ECC Off

Test Std

Pass 22

Errors 2

 

Here are the detailed errors:

 

Test | Pass | Failing Address | Good | Bad | Error-Bits

7 | 3 | 0003c125244 | 26a33050 | 26833050 | 00200000

7 | 7 | 0001fe25244 | afac7188 | af8c7118 | 00200000

 

So, both fails on random sequences, both failed near a similar address, with the same error-bits. Strangely enough, I didn't get any more errors after the 7th pass, up until the 22nd pass.

 

Are these errors acceptable? Am I to expect some natural errors that is unavoidable or are these caused by the different RAM sticks?

[RAM GUY]

Set the memory frequency to DDR333 and see if the errors go away.