Lo Moscow,

if your rams can't do 1200mhz forget 500FSB quad action daily on the P5Q series... Buy yourself a 9550 and you will have 4Ghz for sure... more is all luck: good CPU, High speed rams, Good mobo, PSU , Cooling etc....

Unless you are multitasking or ya apps support the extra cores, you will not feel much difference over ya OC'ed dual core...