I just pieced a new computer for my friend consisting of a AMD Athlon X2 4400+ 2X1mb toledo with an ATI X1800XL and the full works. Well, in the ATI driver setup in the overdrive section I used to test max overclock through driver. It spans from the default clock of 500mhz to 575mhz and the memory goes from 495mhz to 550mhz. Well the card maxed out and did not heat up at all. It stays 87C to 89C regardless. Is there a way to OC more? BTW this is on a stock HSF!! I have it setup to only OC during 3d apps. Beautiful card.