From what i have read, flashing the bios to Ultra is a bad idea The preferred method is just to overclock it :thumbup:

The problems arise when trying to keep the GT cool, it's not possible unless you attach a seperate cooler to it. This is just not worth the effort for a few FPS.

Also, if you flash the card and fry it, you can't flash it back before trying to get a refund, so the company you bought it from will know what you have been up to.