my gpu (ati) is overclockable..but it overheats too easy..it's a little underclocked atm..CPUs are intel LGA771 in a dell case with proprietary BIOS..not overclockable (bus speed/voltages/anything to do with OC'ing is locked..FUCK DELL ASSHOLES)...and there are no 'hacked' bioses for this (be it hardware or software)...they're extreme cpus (so they're capable-in fact made to be OC'ed)...but shitty mobo/bios..oh well..they'll last longer anyway...will make a nice server machine one day..either way this machine rocks my cock