6970 has a fully enabled processor vs the 6950. I know you can flash the 6950 to a 6970 bios but their is a reason they placed the 8 pin power attachment on the 6970.
His talking about 68
xx, not 69xx series.
Me, personally - 6870, not just coz i have one, but also for the extra shaders
And its just sooo cheap right now.