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Can't Get 4 x 1Gb 6400C4 RAM to run Stable on M2N32SLI Deluxe


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I was previously running 4 x 1Gb of the Corsair 6400C4 RAM. These were bought as two TWIN2X2048-6400C4 kits populating all of the 4 ram slots.


The ram ran stable under bios 2001 under 4-4-4-12-22-2T at DDR2800Mhz at 2.1v. I even ran a EPP profile of high performance without any problems.


I flashed to the latest 2205 bios which created major issues with ram stablity so I flashed back to 2001.


Since then I haven't been able to get a stable system. I get lockups in windows and the every morning when I switch the PC on for work I get a freeze on the BIOS screen and it wont post. I usually have to take a stick of ram out and put it back in to post.


Ive tried running the ram in the following configurations and all results in problems.


- default settings

- default settings with 2.1v

- default with EPP

- manual 4-4-4-12 and 5-5-5-18 with 2.1v

- manual 4-4-4-12 and 5-5-5-18 with EPP


Ive attached some CPU-Z screen grabs if that can assist anyone



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