My card is the Nvidia GTX 460 SE
PSU is Cooler Master Extreme 2 Power 625W
The Cooler Master Extreme2 series were known for their under spec'd +12V rail switching transistors. That's the component that would usually burn out first.
You couldn't safely draw more than 80% of the rated Wattage. The +12V rails' voltage regulation would go out spec if you attempt to do so.
I'm not surprised, one bit, that it failed.