I have a second PC with a 300W PSU. I had a spare Geforce 6600 lying around and put it in this PC, but the PSU can't handle the extra power demand. Now this might make me seem like a computer cretin, but can I just connect a 250W PSU (which I also have just lying around) directly to the GFX card without it being connected to the Mobo, or will that fry my PC? Sounds silly, I know, but I don't have money now to buy a new PSU. Any help is appreciated!