I did hook up the molex plug even though the manual said it was unnecessary except for crossfire/ sli mode. I am not doing sli however.
My specs are Core 2 Duo e6850, Geforce 8600, 4 gigs ram, Ubuntu linux 8.10 x64.
I didn't use an installer disk I just moved the asrock board into the case and hooked up all the drives. I could try booting the live cd but I don't believe that would give problems when a previous install does not.
Network, sound, opengl 3d desktop all seem to be working well. Maybe the phoronix reviewer should try again.