The final landing spot for my x2 3800+ is 2500 MHz @ 1.45v on an Epox 9NPA+ Sli. Load temps on both cores do not exceed 50C with a TT Big Typhoon in 80F ambient. It was a bit better on my Ultra-D, but I need my Opty 146 @ 3 GHz to feed the x1900xt residing there. The 3800 @ 2.5 is very nice, the machine is very snappy, gaming is A-OK, especially multiplayer gamig using Skype and Dragon Naturally Speaking simultaneously...........