are u using amd cool n quiet technology? if u installed the driver for it, and have amd 64 processor (you do) then its working as it should, it reduces the clock speed of the processor when idle to the low speeds ur seeing to lower power usage and to lower heat output. when under any load at all, it should quickly jump back up to the normal clock speed.
evga 8800gt dual-slot cooler
4gig (2x2gb)g.skill ddr2 1066
Antec sonata II mid tower
200gb Seagate HDD, 500gb Seagate HDD, 1TB Seagate HDD