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Fake news. These are not Macs and are very overclocked PCs (Hackintosh).

Not sure why this is downvoted? The top score shows a 6.472GHz clock speed - clearly not stock.

Because some of them aren't. For example, result #4. Stock 4850 MHz for a 5800X and it scores over 1800: https://browser.geekbench.com/v5/cpu/4665766.gb5

Also notice this result is using clang9 while the MacBook results are using clang12. I assume clang12 has more and better optimizations.