I second the idea of replacing hardware one piece at a time, I often use the process of elimination to troubleshoot. If the hardware doesn't turn out to be the culprit, as in you try another 6600gt card and it still freezes, try different versions of the driver. You might also try the nzone forums, I think they may be better able to help you if no one here can. Nvidia drivers are their thing, not the linux community's. Not yet at least.
Is your card AGP or PCIEX? If it's AGP, you might try a different AGPGART driver. I know my motherboard (ASRock 939 dual sata) did better with the ULI gart driver, since they did some funky things to get AGP and PCIEX on the same board.
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