Well even when using the 6 pin from the main PSU, I have issues. I highly doubt at this point that its a voltage or wattage issue. I think its just the GPU that's malfunctioning. Either way I was told it didn't work at all, but I got it to "work" on my first try. Maybe they meant "it doesn't...
But you just told me that its pulling too much wattage from the motherboard and I've had the same results from 3 different power supplies. So how would putting a "better power supply" help my problem of drawing too much wattage from the mobo?
I don't believe that it is a power issue because I'm currently using a separate power supply (Thermaltake external PSU) specifically for the GPU. It has the same results as if I was using the 6pin power straight from the main PSU.
EDIT: Tonight I am going to test the GPU out in another computer...
While building a system from used parts, I installed a GTX 650 Ti BOOST, and the only way I could get games to run on it is if I underclocked the GPU. CPU is AMD Athlon II X2 250. When I start a game without underclocking the GPU, the game will crash without fail. If I overclock the GPU even...