@sahilshah1987- Like compo said, you can OC it upto 4 Ghz with stock cooling, but you'll have to increase the voltage. And if you've got Transcend DDR2 value RAM, then your OCing will be restricted. Be very careful when OCing with value RAM. Go for small increments like 2 or 3 Mhz. For significant OCing on non Nvidia boards, you need to invest extra in good RAM modules like the Corsair Dominator series.