Flypz

I got this cooler in last January so it could be the problem. I can see 2 fans connected to my motherboard which could be the radiator fan and they're running at 1500rpm.

I have an NZXT Phantom Enthusiast with 2x 140mm on top for the aio as intake, 1x 120mm on the back and 1x 200mm on the side as outtake and 1x 140mm on front, 2x 120mm on side as intake for the HDDs. I regularly clean the dust off the filters so the fans could get good airflow. I also changed the stock fans on the radiator to Noctua NF-A14.

The pump and fans are always on max. I control my fans from the pc case and the pump from Corsair Link

I've overclocked my i9 9900k to 5Ghz with 1.380V and I had no crash with Cinebench and Prime 95 but my temps are all over the place. When the cpu is under 100% load, all cores are above 95C and the package reaching 100C but no crash. I've tried to increase/decrease the voltage as well as the clock speed but I get the same results with lower clock speed. I have a Corsair H100i GTX as cpu cooling which should be enough. I overclock the cpu according to this video: YouTube Video. I have the same settings except for the voltage. Previously, I had a different OC profile with 4.9Ghz at 1.400V which wasn't very optimal and I had the same problem. Is there anything I could change or something I'm missing?