I have a few of Sapphire's first gen 6950's with the dual bios switch. I've heard you can just flash the 6970 bios, but I felt it safer to just modify the bios it came with, unlock the additional shaders (that were there) and then use the program of my choice to up the voltages and speeds.
of the comments you highlited.
1. seems bios is flashable
2. Perhaps the extra shaders of the 6970 are no longer there, but you could still flash to the 6970 speeds
3. seems to contradict #2
with the dual bios, (switch) you essentialy have a get out of jail free card. If you mess it up you can flick back to the unmodded one and boot, then reflash stock to the modded one and you're back to square one.
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