I hate to post a rival on here, but I thought I'd point this out: Anandtech's review on iBUYPOWER Erebus GT
, with an overclocked Core i7-3770K and two GTX 680's.
And then I saw the benchmarks. Maybe the gaming performance is nothing to write home about since it's SLI and everything is at least double of what the other setups were (with single card GPUs). And then I saw the power consumption and I would've shat a brick. @ Idle, 113W. @load 471, whereas other high end systems using last gen parts were easily going almost double this.
At least we won't have to look forward to dedicating an entire house circuit to powering your beast in the near future.