Bear with me as it's been many years since I've messed with overclocking. I just put together a new build with the following parts: i9-9900k Aorus Master Z390 (firmware F8b) Corsair Vengeance 32GB 3200mhz ram Seasonic 850W PSU Corsair H80vi2 (from old system) (noctua thermal paste) Silverstone FT02 case (from old system) old SSDs and HDDs (from old system) Radeon RX560 (from old system) with stock settings (vcore auto shows 1.20v) I'm seeing idle temps around 25-27c which appears to be normal. When I run Intel XTU benchmark, it's peaking at 81c. But when I run Prime95 small ffts, coretemp quickly jumps into the 90s and even hit 100 before I shut it off. Is the H80vi2 just not good enough? and say you're not overclocking, how do people run this with stock fans? Thanks! **Update...new problem** I don't know what just happened. I tried to do some overclocking following Gigabyte's guide - https://www.gigabyte.com/FileUpload/Global/multimedia/2/file/525/946.pdf I set the vcore to 1.3...then 1.31 all the way up to 1.35, a 5ghz and everytime it rebooted during a benchmark test. Resigning to not be able to get 5ghz at 1.35 (and temps were letting me get any higher voltage), I decided to back down to 4.8ghz at 1.25. This time the crash seemed harder and the computer wouldn't boot to bios. After a few power cycles, it reverted itself back to stock firmware (F4) and reset to default. I then updated it back to F8b, but now my lowest temps are 31c. 5c higher than before. Also now when I run the XTU benchmark, it's jumping up to 100c vs 75c before. I was ok with not being able to overclock, but now I can't even run stock. Any ideas?