Those Gflop/s quoted for the iPhone must be FP32 Gflop/s. The Gflop/s quoted in the past for supercomputers and now for big HPC clusters are FP64 Gflop/s. The

Those Gflop/s quoted for the iPhone must be FP32 Gflop/s. The Gflop/s quoted in the past for supercomputers and now for big HPC clusters are FP64 Gflop/s. The difference in cost between FP64 and FP32 is currently extremely high, much higher than it has ever been in the history of computer technology. The reason is not technical, but of market segmentation, because NVIDIA, then also AMD, have removed the ability to do FP64 operations at a competitive rate from their "consumer" GPUs, so the best that one can get in performance per dollar is AMD 9950X (which can approach 2 FP64 Tflop/s per CPU, i.e. 256 FP64 FMA per clock cycle multiplied by around 4 GHz, with 2 flops per FMA).