Unfortunately even the RTX 6000 Pro has nerfed double-precision throughput at about 2 TFLOPS, 64x slower than single precision. For comparison an EPYC 9755 does ~10 TFLOPS, while drawing less power. An A100 -- if you can find one -- is in the same ballpark.

The best option for DP throughput for hobbyists interested in HPC might be old AMD cards from before they, too, realized that scientific folks would pay up the nose for higher precision.