Ok. So I've had this problem for a while. My motherboard (DFI LANParty DK-790FX-M2RS) Is supposed to support DDR2 1066MHz. Also, my CPU (AMD Phenom II X4 940) is supposed to support DDR2 1066MHz. ALSO, my RAM (Patriot Viper 1066MHz DDR2) is supposed to support 1066MHz. BUT my computer shows it as 400MHz. WHY!? I had found what I thought was the problem; a setting in the BIOS saying: Memory Timings, or somesuch, which was set to AUTO. Well, that wasn't correct, because AUTO was giving me 400MHz. I switched to 'MAXMEMCLK' which opened up a timings submenu, which allowed me to change it to DDR2 1066MHz. One of the titles changed to DDR2 800MHz. Yet, it is still running at 400MHz.
Multiple Exclamation marks - The first sign of an unsound mind.
Rig: AMD Phenom II 940BE, Noctua U12P-SE2 , DFI LP DK-790FX M2RS, 8GB DDR2, 1TB Samsung F3, XFX ATi HD4890 1GB, CM 650 Watt PSU
Thermaltake M9 Case, LG Blu-Ray Writer/Combo
21.5" BenQ E2200HD @ 1920x1080, Razer Lachesis/Lycosa/Carcharias, Windows 7 HP 64 Bit