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Full amount of memory not usable


woe is me

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So here's my problem. I have a p7p55d EVO motherboard. I bought CMD8GX3M4A1600C8 (8 GB) from Corsair, which according to the site is compatible. The problem is that when all four sticks are installed the bios only recognizes 4 GB of memory. When three sticks are installed the bios recognizes 6GB but as soon as the fourth stick goes back in it drops back to 4GB.

 

I have done a lot of searching on this and I keep coming back to the question of compatibility, but the corsair website says the memory is compatible. Anyone have an idea? I appreciate any and all help.

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I have. I went in and enabled XMP but it still doesn't work (with the added benefit that I sometimes get the "overclocking failed" notice when loading up). It continues to only register 4GB with all four sticks.

 

The strange thing is that when I get the "overclocking failed" notice it does register all 8GB.

 

Truly vexing.

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