Not bad for an affordable motherboard (Gigabyte EP45-DS3L, $85 or so after rebate), some cheap Kingston DDR2-800 RAM, and a $30 heatsink. Core voltage is only 1.28V – I’m not going to bother pushing it harder because at this point the RAM is already overclocked and I can’t run the RAM any slower than the current speed. I’m happy with the speed, a 3.1GHz quad-core Core2 is quite the upgrade from my 2.5GHz dual-core Opteron.
One of these days I’ll probably slap a new video card in here (current one is getting a bit old, 7900GS) but I’m in no rush. Probably when the next-gen midrange gets cheap.