it was Furmark being used at Anandtech too. either way its doesn't really matter and I was just surprised the difference was that much.
Could be an anomaly. Perhaps when [H] does some 6870 vs 470 testing, they will test them against each other directly.
Either way I would still take the ~70 W savings. Even the draw of the 6870 concerns me. I would be going for a 6850, it is single power connector and a load I am comfortable with. Not everyone builds monster systems.