Install a different BIOS than it is supplied with and say bye bye to your warranty. Last time I tried rma'ing a card that I had flashed, Gigabyte refused warranty service.
Hm, yet they have BIOS's to download on their website. Not impressed with Gigabyte mainly because even F43 is locked to 1.09V and I reckon I could run at 900MHz (maybe more) at 1.0V but it won't let me.