I have a Ryzen 7 1700 at 3.7GHz. The 4way is around 15% slower than AES-AVX/AVX2 mining nist5. Around 240KH/s per core (8 threads) to 4way and 270KH/s per core to AES-AVX2. Its working stable, but with less performance. I can get 2.1~2.2MH/s NIST5.
This is very interesting feedback. I get 340 kH/s per thread 4way vs 255 kH/s AVX2 1way on my i7-6700K @4GHz.
Something isn't right, need lots of details to eliminate simple stuff. Can you post the startup for both?
None of the following should cause that much of a difference, but it helps to quantify.
AMD AVX2 performance is known to be slower than AVX. Try running a test with just AVX2 and again
with AVX to compare. Another, better, way to copmare AVX2 vs AVX performance is lyra2rev2. It has the most
AVX2 code.
4way uses 4 times the memory of plain AVX2. This will expose any cache performance issues. Try running fewer
threads to see if performance (total, not just per thread) improves.
Try tribus algo, it's pure 4way parallel while nist5 has a serial component which reduces gain and adds some overhead.