Ryzen 1700 3.6ghz (8 threads) - 2.2 kHs
Testing has shown that for the Ryzen 1700, 6 threads is the 'sweet spot'. I (and others) have seen the same, or even better, hash rates with 6 threads then 8. Even better if you can pin each tread to its own core. I get 2.5KH/s with this setup.
However, if you are getting better rates with 8 threads than 6, I'd like to know the details (i.e., platform, commands run, etc...)