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Are they compatible?


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I just bought a set of CM2XP1024-6400C4 and a set of CM2X1024-6400C4PRO.


I install the XP module (2) on yellow slot and pro module on black (2).

When these module are install together, i have errors message with MEMTEST-86 v3.2.


When install individually..... the 2 XP module will work on both slot and same for PRO.


These two modules are different, one with module led display and other with LED only, but have the same latency..4-4-4-12.



Are they compatible together?

Do i have to do something in the BIOS ?

Info: motherboard .....P5N32-SLI PREMIUM


Thanks for your help

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  • Corsair Employees
The MB you have I would suggest 667 MHz memory and with 4 modules you may have to run the memory 533 Mhz because of loading on the memory controller! And I would never suggest mixing memory with any system for best performance!
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Well....i just exchange my Xpert memory for the PRO. I should have it within 2 week.


Having on the board 4 stick of CM2X1024-6400C4PRO..... what are my chance this set up will work?


Right now.... i have 2 stick working great.( CM2X1024-6400C4PRO )


Thanks for your help RAM GUY.


ps...: if you need more details...just ask.

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OK, i have some chance this could work....

i will need your help to configure this please.


Right now, i have like a said... 2 Go ( CM2X1024-6400C4PRO X 2 )

Bios set up is...

* Memory Timing....... Optimal

* xT (CAS)............... Auto

* xT (RCD)............... Auto

* xT (RP)................. Auto

* xT (RAS)............... Auto

* xT (RC)................. Auto

* x Addressing mode.. Auto


QUESTION..... How this should be set to add 2 other sticks ( CM2X1024-6400C4PRO x 2 ) ?

Total of 4 Go


Thanks again Ram Guy.:confused:

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Hey Ram Guy...

There an update on this case....


With the info i received from you, configure my memory bios to eighter 667 or 533 with wattage of 2.1.....


it does not work with 4 Go.


Works fine with 2 Go.


Thats weird. Why work with 2 Go and not 4Go.

Thanks for your help.

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  • Corsair Employees
If you want to over clock 2 modules max is best, and if you are using WinXP32 Bit version it will not see all 4.0 Gig of memory. But if you use 64Bit version of Windows then 4 Gig might be the best choice even its running at a slower speed.
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