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Abit sg-95 not booting with 4gb of RAM installed

My Abit SG-95 doesn't boot when i install 2x2 gb of ram both sticks are identical and run ok when i install them individually but when they're both installed i can only access BIOS and see that the MB only recognizes 3072 Mb of memory although i am running windows 7 x64 after fiddling around in Bios i was able to get to windows welcome screen but the colors where in 16 bit and ran very slowly ... Right now i have installed one 2gb stick and another completely different 512 mb stick and everything runs perfect. I have tried everything i could think of but nothing helps...

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