CryptiK,

Looking good, looks like 4.2GHz or even 4.3GHz very possible on resonable volts for 24/7 with your E8400. From what I have seen, the E8600 would do a 4.5GHz 24/7. No that much improvement, on a dual, you wouldn't notice that difference on 24/7 operation.

Now if you are looking for a cpu to bench, then I would say E8600 would be much better... You would bench @ 4.9GHz aircooled or more with a good chip and with some agressive volts.

[]'s
Simps