The A64FX has way worse performance per watt than an AMD EPYC and an A100. The A64FX's density per U is higher, so you can get a lot more cores in the same datacenter, even if the TFLOPS/watt is far worse.
For example, if you look at the TOP500, #1 (A64FX) gets about 14.78 TFLOP/watt, #5 (EPYC/A100) gets 27.37 TFLOP/watt. Most of the A100 based solutions are similar performance per watt. Nvidia is already beating ARM in power efficiency. This looks closer to the 3dfx acquisition from Nvidia's prospective.
For example, if you look at the TOP500, #1 (A64FX) gets about 14.78 TFLOP/watt, #5 (EPYC/A100) gets 27.37 TFLOP/watt. Most of the A100 based solutions are similar performance per watt. Nvidia is already beating ARM in power efficiency. This looks closer to the 3dfx acquisition from Nvidia's prospective.