Judging by my PCs (M4 Max Mac Studio; 2990WX desktop PC), Geekbench might flatter the Apple chips for multicore a bit I think:

Geekbench 7 results:

* AMD 2990WX: 1384 (single), 13052 (multi) (https://browser.geekbench.com/v7/cpu/181239)

* Apple M4 Max: 3552 (single), 29863 (multi) (https://browser.geekbench.com/v7/cpu/390256)

For parallelisable stuff that can occupy all cores for an extended period, the 2990WX typically takes about ~1.2x as long to do the same work/does ~0.83x the work per unit time, assuming code compiled with clang or gcc. Which isn't really coming across in the numbers here.

CPUMark is a bit better:

* AMD 2990WX: 2282 (single), 32040 (multi) (https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+Threadrip...)

* Apple M4 Max: 4590 (single), 43911 (multi) (https://www.cpubenchmark.net/cpu.php?cpu=Apple+M4+Max+16+Cor...)

I haven't spent much time timing single core stuff, except - regarding clang, which looks like it contributes to the Geekbench 7 score, I did some measurements a few months ago suggesting that clang compiles for x64 more slowly than for ARM, all else being as equal as I could be bothered to try to make it: https://news.ycombinator.com/item?id=46938682 - and the single threaded test runs I did of my code suggest that the Geekbench 7 single core might be about right?

(Whether the clang timing discrepancy is actually relevant to Geekbench, I've no idea, but I thought it interesting anyway.)

If you need a benchmark that makes the PC look massively faster than the Mac, I'm sure those are available too.