MichaelD Posted October 8, 2010 Share Posted October 8, 2010 I have two kits of TWIN2X40966400C5 (4x2GB) in a brand new Asus PQ5 Pro Turbo running the latest BIOS. The two memory kits were bought at the same time and are rev1.3. Each 2-piece memory kit has sequential serial numbers. I.E. Stick 1 is xxx702, Stick 2 is xxx703. I have these "matched sticks" on the same memory channel. I.E. 702 in first yellow memory slot, 703in second yellow memory slot. Same with the second kit. The memory should be running at 800MHz, but it's not. It runs at 816MHz and causes issues on warm reboots. I.E. the fans spin up but the board doesn't post. I have cleared the CMOS multiple times and have everything on Auto. Through trial and error I found that if I hard-set the FSB to 400MHz, then I get a solid 800MHz and no reboot issues. I ran three passes of Memtest 4.10 and got no errors. Any ideas? Link to comment Share on other sites More sharing options...
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