I don't see how you can claim the 280 more power friendly but I'm not gonna fight that.

Besides no high end card is power friendly at load and like I said the idle issues with 4000 series aren't fixed yet.

As for the 4000 series over clocking....your comparing a 4% core overclock to what a 20%? Yeah a little unfair since we all know memory clock isn't gonna make a huge difference in FPS.