NVIDIA Tesla K40 and K80 professional graphics cards are also based on Kepler architecture, but with significantly better performance. The Tesla K40 (GK110B core) has 288.4 GB/s VRAM performance (28% faster than GT770) and FP64 throughput of 1.682 TFLOPS, twelve times faster. It has an impressive 12 GB of VRAM, even by today's standards. Based on this performance, the Ethash hash rate of the Tesla K40 should be 36 mh/s, which is decent these days. With a TDP of 245 watts, the Ethereum mining efficiency is 0.15 mh/s per watt. In practice, the mining efficiency of NVIDIA Tesla K40 is much lower, because it is not so easy to use the full computing power of this card in today's environment.