https://wccftech.com/intel-nuc-11-extreme-beast-canyon-with-core-i9-11900kb-cpu-tested-just-as-fast-as-any-desktop-gaming-pc/

Intel's NUC 11 Extreme 'Beast Canyon' PC featuring the Core i9-11900KB CPU has been tested. The latest performance numbers come from within the 3DMark database (via Benchleaks).

The difference between the Intel NUC 11 Extreme and a standard gaming PC is nominal. The NUC comes within a small 8L chassis which means it has lower cooling potential than say a gaming PC that's been configured in an M-ATX or standard ATX chassis. The extra heat can definitely affect the performance of the hardware and throttle it down to lower clocks. Furthermore, the components are all tightly cramped and you can't expect the top-of-the-line CPU cooling solutions as you'd get on a standard gaming PC.