An Intel i7-6700 will do about 200 single precision GFLOPS[1] and costs about $300 [2]. An Nvidia GeForce 710GT will do about 350 single precision GFLOPS [3] an

An Intel i7-6700 will do about 200 single precision GFLOPS[1] and costs about $300 [2]. An Nvidia GeForce 710GT will do about 350 single precision GFLOPS [3] and costs about $40 [4]. You are right, and I stand (mostly) corrected. Alternatively said for Skylake, with unrolled 256-bit FMA, you can calculate close to 16 single-precision floating point calculations per cycle per (physical) core: two vector loads, one vector store, and the 8x32-bit FMA itself. At 4 GHz this is about 100 Gflop/s per core. For 4 cores this is about the same 350 Gflop/s as the $40 graphics card you pointed to. And realistically, loop overhead will knock you down another 10%, and if you run for any length of time you probably be thermally throttled back to something closer to the 200 Gflop/s you cite. My general question about why no one is interested in using the built-in Tflop/s capable side of the Skylake die stands, but I was wrong to think that a well-tuned desktop processor could come anywhere close to the price/performance of a cheap graphics card for raw flop/s. Thanks for pointing out the real numbers.