This isn't the first time Nvidia have meant to have released a driver that damages the GPU.
Take a look of this YouTube video
http://www.youtube.com/watch?v=sRo-1VFMcbc&list=FLf3qrmLynVBz4OOdzStcwdw&index=2
But AMD have bad drivers
That card has been overclocked from 700mhz 938mV to 772mhz 1025mV, overclocking has always been at the owners own risk.