X2 3800+ hands down, The 920 is only $37USD cheaper( so money is not an excuse), it's hotter , slower, and need a very expensive mobo to OC. The X2 3800+ is faster at stock, cooler OCED and at stock, and OCs to 2.6-2.7GHz (need a PD 4GHz+ to equal that) With cheap boards, Are you still thinking...