Hello, I have a setup with MB Abit IX38 Quad GT, Q6600 @ 3200 CPU, 8800 GTS 512, SSD Drive.
I use OS X on this system since 10.5.2 and it worked great, vanilla installation and any FakeSMC and AppleRTC usually needed, plus chameleon boot loader.
I don't have SpeedStep enabled (because OC) so...