BIOS originally dumped with AtiWinFlash 2.74 on "silent" BIOS jumper position.
Modified with PBE (polaris bios editor) 1.4
Clocks 1125/2080 tuned to keep GPU and mem controller load maxxed.
Cooler profile - unmodified
Flashing and installing procedure can be found in Boysie thread
It's strongly recommended to flash your card, when BIOS jumper is on "silent" position - when jumper moved to DVI/HDMI connectors side.
You can also use Sapphire trixx, wattman or something else you want - to modify voltage (in most cases it can be lowered), clocks and cooler profile.
BIOS seems to be stable, but use it on your own risk and make backup of your original BIOS before any change/flashing.
If you forgot to do it, you can find it here
Joke! Even if you do something wrong and catch some troubles - simply boot your system with "default" BIOS jumper position. You can switch it on the fly after booting your OS and flash your original unmodified BIOS.