I have and have flashed a Sapphire 9750. It has to be the 2gb version, its the only one with a bios switch. Postion one will flash, two is default. So you could dead board it I guess, no reports of this particular card going dead I could find. Just switch to bios position 2, the flash is gone.
It is running flawless and cool for the last week.
The .v2 shipping soon will not have the bios switch. As well it is not flashable. Only this first series of reference boards.
I do not recommend doing this unless you are very tech smart. (I overclock every one of my machines, for over 10 years now)
I followed their directions to the letter.
http://www.techpowerup.com/articles/overclocking/vidcard/159My card matches their gpu-z report exactly
And yes its fast. With a 45% fan speed it idles below 45*C, the highest I have seen it go in AH2 is 56*C
DX11 vs DX10 as well 6950 and 5870 respectively
Buy or don't buy what you want. Just posting because I have done it.
My system:
Intel Core2Duo E6850('Conroe')3.0 @ 3.4
Asus P5E Rev 1.03 903 bios
Arctic Cooling Freezer 7 Pro
OCZ EL DDR2 PC2-8800 4GB @850mhz 4-4-4-12 (1to1 ratio)
150GB WD Raptor 10,000RPM x2 Raid0
300GB Maxtor 7200rpm
640GB WD 6400AAKS x2
Sapphire 6950 2gb @ 6970 (second one on the way)
E-MU E-DSP Audio Processor 1616m
PC Power & Cooling 750 Quad PSU
Antec SX830 Modded
Windows 7 Pro 64bit
Viewsonic VX2255wmb x2