[NAME] what you're describing sounds like normal Intel TurboBoost behavior. I won't bore you with all the technical details, but basically the CPU is allowed to go over its advertised wattage (65W) for a limited period of time (about 30 sec), after which it's pulled back down to 65 for a while, and then allowed to boost again and so on. If you install a free app like ThrottleStop or Intel XTU, you'll see those limits (called PL1 and PL2, the duration is called "tau"). I recommend ThrottleStop over XTU, as it has way more features and allows more control. The good news is that you can bypass those limits and allow your CPU to boost indefinitely, as long as you upgrade your cooling to keep the temps under control (otherwise, it will thermal throttle when it gets close to 100 degrees). ThrottleStop can save the day again. You can change the power limit to as high as 250W and the duration to a few million seconds (which basically means forever).  Here are the settings for my 10900 nonK. After doing this, it boosts to over 200W and stays there for as long as the benchmarks are running. It does get hot though, so I've only done this after upgrading the cooler from the default Dell "pancake" cooler to a good quality Noctua tower cooler. [IMAGE]  Note: if you notice that the increased power settings are not "sticking", this may be due to a BIOS limitation imposed by Intel to all manufacturers last year. The good news is that you can remove that limitation too with a bit of patience and care (warning: this involves editing raw BIOS code. do this only if you're confident you know what you're doing!). Instructions here  Bonus: this BIOS mod will also unlock the ability to undervolt your CPU, which will keep it cooler without losing any performance.
Just a little rant about how stupid the Dell BIOS is. Their bios by default limits all non k cpu to 65w. But CPUs like the i5-11400 (the one I have) draws way more than that. Because of that when it's hit with a heavy multi-thread application its runs about 50% of the performance that it's supposed to. I just hope they unlock all 11th gen non k to upto 95W since the motherboard supports it.
XPS 8940, 11th Gen CPU power limited