My suggestion would be to up the "Bus Speed" and North Bridge as high as you can go and be stable, with the NB being the more important one. The HT Link should stay around default (1.8), however in some cases it does benefit graphical benchmarks/games from 2200 - 2400, but I would not go much...
I replied to your post on the ASUS forums about this but in case you don't see it there I will reply here as well.
I ran into the same issue and have seen others with the problem as well. It seems to be some type of incompatibility between the MB and PSU. I was running a Thermaltake...
As much as I stop buy and read the forums and what is going on I thought I should post this. I figured some of you might find it useful.
The link below is to a post that I update daily (except for sometimes on the weekends) that lists and has links to good PPD folding cards that are all under...