well at the end of this year I'm going to go Quad again. But I want a chip that can hit 4GHz on air and maby a little more. My question to you is. Should I buy the E8400 or the E8500? I have the E8400 in one machine but it is CO stepping and I want a EO stepping so how do I tell if it is EO and not CO? I would love the E8600 but for the price I don't think it's worth it.