Ive got my XP 1700 OC'd to 1850mhz with a Vantec Aeroflow HSF. My CPU temp stays between 98-102* F (38-41*C), even while gaming. Thats according to the mobo temp sensor, Motherboard Monitor and CPU Cool. Temp seems awfully low considering the amount of OCing Im doing. With my last board and stock cooler ran about 110* and up to 125* gaming.