[phantomwhiskers]

I also recently built a system with the 14900KF on an ASUS TUF motherboard and NZXT Kraken 360 cooler, and so far I haven't experienced any issues running everything at default BIOS settings (defaulted to 5.7GHz). I haven't seen temps above 70C yet, although granted I also haven't seen CPU load go above 40%, and haven't tried running any benchmarking software.

I'm curious about what you are using for cooling, as 90C at 5.4ghz seems way off compared to what I am seeing on my processor, but it could just be that I'm not pushing my processor quite as hard even with the higher clock rate.