I bought a built PC a few months ago, and was going to start overclocking it earlier this week, but when I starting looking at temps, the CPU is running pretty toasty. It's an i7-5820K. I'm stumped on how to get it to acceptable temperatures in order to even attempt an overclock. At stock speeds, it idles at 55C in the BIOS, and at 60C on the desktop. It gets over 80C while starting windows. And in a 5-minute stress test in Intel XTU, it hits thermal throttle at 103C within 45 seconds. I've replaced the thermal paste on the CPU, and made sure that the cooler is seated properly. I've checked that all the fans are running, and have tried Turbo and Full Speed options with no noticeable difference. I've been using XTU to monitor temps.
Case: Phanteks Enthoo Evolv
Cooler: Corsair H110i GT 280mm
The case has two intake fans on the front, and one exhaust fan at the top rear. The AiO is top-mounted with four 140mm fans in push-pull that exhausts out the top of the case.
Open to any suggestions.