XPS 8950, CPU i7-12700k temp issues

I have a new PC with i7-12700k CPU and the water cooled option. Also a GeForce RTX 3060 Ti card. I don't have much experience with benchmarks but have tried to educate myself and use several apps to monitor, to see if performance matched expectations. CPU temp was an issue, running AC4 Black Flag on 4K res setting stressed the CPU to 90-100C range (game set to Let Windows Decide (High Performance), and the case was quite hot to the touch after around 15-20 mins of playing. This is an older game from 2013, I got this PC to play newer games like AC Valhalla (when the Intel 12th Gen DRC issue is resolved), so this was a concern for me.

Last night, the PC abruptly stopped connecting to the internet and I needed Dell support. It was resolved with a network reset (Windows 11 option), and the Dell guy had me update the Killer Wireless driver and BIOS (to 1.0.8). To my surprise, the BIOS update appears to have dramatically improved CPU temp: the max CPU temp dropped to 50-60C range playing the AC4 game, and the case stayed cool. I saw a prior thread on this forum where someone speculated about this, I'm posting to share this is my experience too. Can BIOS update really have this dramatic an effect? I wonder how many other Dell XPS 8950 owners could benefit from this? 

Also, I have a new Dell S2721Q 4K monitor, Windows 11 has picked up on this, several games too, but in Device Manager it's shown as Generic PnP Monitor, and the Windows 11 HDR setting says not supported for HDR. When I checked online, it seems the monitor should have HDR playback capability, is there an issue here? Do I need to troubleshoot and resolve Generic PnP in Device Manager or is that harmless? Online research suggests root cause could be the connection (HDMI cable) but if that was the case, why is Windows 11 able to identify the monitor correctly?

Thanks.