I just thought the dual core HSF would be good enough for my single core 660 @ 4GHz, but I'm already pushing 60C running BF2 in my current system. The thing is, I've finally saved enough to re-building an old system (socket 478), I'm trying to keep from buying a new heat sink and I was gonna use the 7700 on the 478 CPU because the Dual core HSF isn't compatible with the P4C800-e Board I have. Oh well, guess I'll have to spring for a Zalman 9500 for my current rig and pass the 7700 down to the 478 rig... just hate to spend another $60.