You can't really o/c a i740 card with software, but Powerstrip helps a little by adjusting the memory speed.
You can o/c the AGP bus from 66MhZ to 100MHZ by setting the AGP CLK settings to 1/1 if you have a 100MHZ bus system.
I had a Eontronics Picasso 740 8MB board that I o/c'ed with powerstrip which gave me 76fps in Forsaken in 800x600 24bit color. It used to be about 45fps.
Then I o/c'ed the AGP bus to 100MHZ and put a fan over the heatsink to keep things cool. Then I got 89fps in 800x600 24bit color.
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