That's single precision, which the DOE doesn't care about. The latest NVIDIA GPU's do 8 to 16 times better at single precision (32 bit) floating point compared

That's single precision, which the DOE doesn't care about. The latest NVIDIA GPU's do 8 to 16 times better at single precision (32 bit) floating point compared to double precision (64 bit). The best next generation DP GFLOPs/watt from one of the big players will most likely be the 2016 Xeon Phi, at ~10-12GFLOPs/watt... You are also forgetting that GPUs also have a ~100W+ CPU sitting next to it, which brings down total efficiency significantly. Shameless self promotion: My startup (http://rexcomputing.com http://rexcomputing.com) is aiming for 64 double precision GFLOPs/watt, and 128 GFLOPs/watts single precision for its first chip next year.