I personally use "Riva Tuner", when I'm OC'ing my MX-400. I tried power strip and didn't like it as much. As for the drivers, the latest from Nvidia are pretty much the best of the bunch, unless you wanted to try a 3rd party driver. But I really don't have any experience with those. To boost your performance you can try the Quadro hack, called "SoftQuadro". But the drawback is that it is only compatible with older drivers.