u adjusted it before, rite?
for mobo, just reset BIOS, and 6870 default GPU voltages are 1.175V , according to this site http://www.hexus.net/content/item.php?item=27238
if the OS or game freezes, it could be a faulty Hard Disk as well, disk check yet?
are the freezes limited to MW2 and BC 2 only?
Thanks 4 answer, I desfragmented my HDD with TuneUp, used the "sfc scannow" in cmd, 0 errors. MW2 and BC2 and Black Ops, all three. Maybe RAM? Maybe PSU?