Power consumption is certainly not Bulldozer's strong suit.
I'm just pointing out that it's not as outlandish as some people may perceive it to be.
@4.7Ghz, your still getting outperformed by an X6(at 4.2) which is pretty good for rendering, matching the Bloomfield quads. The X6 can be had for $150 brand new...
At stock settings, a 2600k only consumes 65w, half of Zambezi.