I just purchased a new PowerColor HD 5770 card to upgrade my twin X1900XTX cards in my Asus A8R32-MVP motherboard. I researched before I purchased the card to be sure it would be compatible, and other than it downgrading to PCIe 1.0, it seemed to be ok. My power supply is an Enermax Liberty 620, so I know I have lots of power there. I put the new vid card in, and it won't even get to the BIOS, no POST beep or anything. I called PowerColor, and they said some motherboards do not support a 1GB vid card? Has anyone heard of that before?