I'm running 3120mhz (240x13) on Asrock Dual939-Sata2 motherboard, with their AM2 daughterboard installed, with Athlon X2 5600+.
It's my main computer, runs Vista perfectly with 2 gigs DDR2 ram. The responsiveness is excellent, I have no desire(well, little desire) to upgrade to anything faster, not even an overclocked Core2.

rjsand99