Gigabyte 6800 here - worked well for unlocking the pipes that weren't hardware masked, but the HW masked ones cause artifacts in WoW. In other words, I only managed to turn it form 8 pipes to 12 (catching up to every other 6800 in the market). Still quiet (no fan) and cool (with case airflow, no signs of overheating danger).
I did flash the video card's bios with the latest version.