I bought a Msi 7513 775 motherboard at a boot fair for £5. I took the Heatsink fan off to see what CPU it had in it and found out it was an E8600 so I want to upgrade it to a Q6600 or Q9400 or Q9500. I understand I will have to get a different Heatsink Fan can anyone tell me the number of the one I need? I have asked on eBay but no one seems to give a definitive answer.