On my ryzen 2600, I can get away with emulating a pentium MMX 200 in most games on windows 98, but there are cases where I have to go one or two models lower to maintain the emulation speed.

It then occurred to me, maybe a stress test program could be a better gauge. I tried prime95 but it throws an error and stops, probably because the FPU emulation isn't accurate enough.

I recently found HeavyLoad. It has four types of tests for different parts, CPU, memory, etc. I disabled all except for the CPU test.

It absolutely thrashes the emulation speed; goes to about 57-60%. I have to switch to a pentium 100 to maintain speed, and even then it's right at the border.

Does this app show an accurate representation of the host CPU's emulation capability under absolute max load? or could it be that its code simply does not play well with PCem?