Nick-
I think your assessment of Haswell's CPU vs iGPU power/performance is out of whack. First let's look at an example
2C + GT2 desktop; 30W @ 4GHz = 250GFlops; GT2 - same 1.2GHz @ 15W = 400GFlops
It looks like the GT2 die area is roughly equivalent to 3 CPU cores (based on these die...