Hi guys, I need some help. I recently purchase a new rig with Core i7 13700K (to replace LGA1156).

I did some video converting task and run HWmonitor, found out that CPU temperature hit 90 Degrees. (some core reach 100 occasionally).  I think this is not good for the system please correct me if I'm wrong. The processor load for E core is almost 100% but P core is still like less than 30% load. Is it something normal? ( Sorry for asking as 1156 era does not have those special core term, and kinda newbie on this )

I did some research that undervolting will help to reduce the temperature and maybe improve the overall performance as well. I read the guideline in website, its seems like its not hard to toggle it, just need you guys to share with me, usually the safest voltage undervolt is how much for 13th Gen processor? I know its random, but maybe just a rough idea where I can start to be careful on value.

There is night and day difference between cheap aio and expensive ones. 360 doesn't mean it gets a pass. Which cpu and aio?

More crucially, how it was mounted?  The way how an AIO is mounted can have significant difference in thermals

Yeah, low budget 360. Not great. Try switching it to intake, rear fan as exhaust. Upgrade the thermal paste too.

https://www.tomshardware.com/best-picks/best-thermal-paste

Its an old AIO, designed for CPUS predating LGA1700, yes despite it having the proper mounting kit after, it was meant for up to Rocketlake CPUS meaning only max up to 125W TDP. Your 13700K max to 253W so its overloading your AIO. Time to move onto a newer 360/280 AIO.