Intel Q6600
2.4 GHz Quad Core - good price and performance.
(G0 and B3 Stepping - G0 Stepping is cooler and better for overclocking)

Reported successful overclocks:
B3 stepping 2.8 GHz

Intel Core 2 Duo E4500
2.2 GHz Dual Core - decent price - good for overclocking.

Intel Core 2 Duo E6400
2.13 GHz Dual Core - Works Out of the Box

Reported successful overclocks:
2.93 GHz and stable - got to 3.0 GHz but becomes unstable (kernel panics when running Handbrake.)

Intel Core 2 Duo E6750
2.66 Ghz Dual Core
No Complaints, just wish i got a 1066FSB Chip rather than 1333FSB (ex. E6700)

I have not OC'd Much. I may and report back.

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