I've been using the Skull=1 Skull=2 options with two instances of realtemp running for years now on my dual quad xeon setup. The only issue I've found is you can't launch the two instances of realtemp at once, most of the time one of them will be messed up, I don't recall the specifics. I use a batch file to launch one, wait, then launch the other. I'm also planning to pick up an 5960X soon. I'm just waiting a bit (for a change) to let everyone iron out all the kinks first. If there's anything I can do to help let me know.