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r45/ PS CS3/nv 9300M GS

Just tried it out, found the artifacts gone, great.
Also, even on a weak card such as nv 9300M GS, GPU mode is still a few times faster(6.63s vs 43.55s in my test scenario)

Also, GPU and CPU rendering produced identical results, except only a few pixels different by 1 level.

But for just once I had a strangely blurred preview window as cyberbeing had in the screenshot, it returned normal after panning the view a little, and I was not able to reproduce that error. It could be a giltch, but it may also be just my mistake...