Ok so I just built a cusom computer yesterday. I have msi 790fx-gd70 motherboard, ocz 1600mhz ram, amd phenom II x4 955BE, radeon 4870 1gb gddr5, and the rest really doesnt matter much. Anywho...the motherboard says it will do 2133mhz on the ram but I only want 1600mhz. My ram is 1600mhz standard. The problem is when I load it up it auto configures the ram to 1066mhz. I have tried manually setting the ram to 1600/1333 and the voltage from 1.65 up to 1.70. When I get to windows it will run for a few minutes and crash with either one. It is only stable in 1066mhz. I just want it to run at 1600mhz or 1333mhz with tight timings but there are so many options in the settings its pretty hard. So as you can see this isn't really an overclock but I have to overclock it for it to work. Any help is appreciated.