I want to overclock my i7 2600k from 3.40Ghz to 4.5Ghz. Currently its running on the stock heatsink which i presume is not effective enough to dissipate the amount of heat which would be produced under heavy load. I have done some research on the existing heatsinks out there but i'm still confused as to what would be very effective. I am only interested in fan cooling, and have a budget of £50 max. The motherboard is an Asus P8P67 Deluxe socket 1155, any suggestions on what would be my best bet? The PC is also used for gaming.. obviously a heatsink which is effective, relatively cheap and very quiet are my main requirements.