I've had the card a few months. I bought it used off this site and its been fine ever since. Its factory OC'd and I havn't clocked it any higher. But it shouldn't be the card since I replaced it with a GT240 and still gives me the same problem. The GT240 also uses alot less power than the GTX460 (there arent any power connectors needed, max 75W through PCIe bus), and I've also taken my overclock off so its using a lot less power than max. My max before was even only 400W on a 600W power supply.
OT: Yes it is! First try at putting it on...was ok. But fun