I have an AMD 64 3500 that i just did a clean Windows XP install on. When I check my Device Manager there is a "?" next to the option for the SM Bus Contoller. Its an HP and their website is no help... The AMD website let me down too.. The Mobo is an ASUS Amberine. Chipset is ATI Radeon RS480 and Southbridge is ATI SB400. I've had no luck finding the drivers needed. Any one have and suggestions?? Thanks