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More Problems with MSI K9N SLI Platinum and TWIN2X2048-6400


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I've posted here in the recent past regarding issues that I've had with two new systems I built. I'm not sure what the proper etiquette is for starting a new thread post, but I figured that the problem that I am currently having warrants a separate thread.


I recently built two computers consisting of the exact same components:


Memory: Corsair TWIN2X2048-6400

Motherboard: MSI K9N SLI Platinum (with the newest BIOS - v1.3)

CPU: AMD X2 4600+ (socket AM2)

Power Supply: Antec NeoHE 550

Video Card: evga 7900 GT KO


I had some initial difficulty getting the memory to run without errors. (Discussed here: http://www.houseofhelp.com/v3/showthread.php?t=53719) I was eventually able to get the memory to run at 5-5-5-12-2T-2.1V at 800MHz. Both systems were able to run through multiple 24 hour sessions of Memtest without any errors.


After solving the initial problems I proceeded to finish testing the stability of the other components in the systems by running Prime95 and 3dMark06. Much to my dismay both systems repeatedly crashed in either test. Since the systems passed through Memtest, I thought the problems were not caused by the memory. However, after several weeks of testing everything I could think of I purchased some 667 MHz DDR2 from a local computer store. As soon as I tried the tests with the new RAM the system ran without problems. It then occurred to me to try running my Corsair memory at the 667Mhz speed as well.


Using the Corsair memory with the timings mentioned above at 667MHz, the systems are able to go for more than 24 hours in Prime95 without problem. As soon as I bump the memory clock up to 800 MHz, the systems crash in the Prime95 Blend test in less than 15 minutes. This is the case with both systems.


Does anyone have any suggestions for what I should do to get the memory to run at 800MHz? Has anyone ever heard of memory-related stability problems even when Memtest reports no errors?


Thanks for any guidance you can provide.

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