They’ll be released July 7th in the US (7/7 for the 7nm parts).
The 7nm Ryzen clearly beat earlier chips, especially for numerical workloads.
I think they also look like much better choices than all non-avx512 intel parts, which is why I focused on them.
If you don’t mind installing a bunch of unregistered libraries, you could try benchmarking the vectorized pow functions here, or small matrix multiplication like in the “3x or more faster than Eigen” link.
Here is a 2950X GeekBench result that did very well. By adding .gb4 to the end of the urls, you can see some sampled clock speeds. That one ran at 4.4 GHz, while the 395prototype was slower at 4.29 (the released version will clock higher).
While its overall scores were comparable to the 3950X, in SGEMM and SFT it was 62.9 and 10.4 GFLOPS vs 98.8 amd 13.5 GFLOPS.
( I suspect the jump is smaller than that provided by avx512, because avx512 does the number of registers on top of doubling their width, letting you use larger kernels, reducing the ratio of move/fma instruction ratio.)