Is An FX-8370 Viable For Emulation?

I have an FX-8370 8 core @ 4.0GHz and while I can get Demon's Souls to run, it does not do so very well. I get slowdown and garbled/corrupted audio.

I checked out the Quickstart guide and it recommends a six core Ryzen or better. Looking around online most of the six cores tend to have a lower clock speed. So, I was wondering two things:

1.) Is there anywhere to get an FX-8370 to produce decent results?

2.) What makes a Ryzen better when it has less cores and/or a lower clock speed?

Thanks, I really appreciate any help/advice on this issue!