In theory you will see a much larger OC with the E4300 thanks to its 800MHz base FSB. Now that the E4300 is available, you should be able to get much better OCs out of the board. Max stable is usually around 1200MHz FSB, so we're talking upwards of a 50% OC in an ideal world. Of course I havent tested an E4300 in the board, so ymmv, but I would definitely go for the E4300.