ATI GPU2 doesn't play as nice with the SMP client either I found out. Somehow running it on my rig (Q6600 @ 3.2GHz and ATI 4870) dropped my SMP PPD super low, like, lower than the PPD of my old opteron 165 @ 2.8GHz! I don't understand how. And it was really unstable too... ATI's client needs more work