Would it be ok to power the graphics card off a different psu than the one used for the main computer? I'm not sure if the rails would join somewhere on the board. I need to rma my main power supply, and my older psu's I feel won't be able to keep up with the load of everything. So I'm figuring I could run my fans, pump, hdd, and graphics off an old 350W psu, and the motherboard off another 350W psu. Any problems with this? I figure if the different rails are fused together, the psu may try to fight with eachother in regulation