I'm going to purchase an e6420, and since I'm definitely getting an aftermarket cooler I figure I can save money by buying and OEM chip instead of the retail package with that useless intel heatsink. Now, the problem is I remember hearing bad things about OEM chips, especially for overclocking. Something like you can't be guaranteed that the chip is a good one, so it's better to spring for the retail version to get that assurance. Is this true? Is there something about OEM processors I need know about before buying one? If it makes any difference I'll be getting the OEM chip it from a Fry's retail store because I have a gift certificate there.