Forget it, Socket 423 is dead. Socket 478 P4's are already on the shelves. the last Socket 423 to be released will be the 2.0GHz. Socket 478 CPU's are avaialble in all speeds from 1.5GHz up, and all future speeds will be based on this socket. The Abit TH7-II is a Socket 478 board with the same 850 chipset and similar overclocking features.
Back to you Tom...