I have a Dell XPS 8930 with i7-8700 processor. How do I control the high temperatures of the CPU (99°C) without upgrading the fans/cooling system? The CPU fan and top fan have not been upgraded - they are exactly how Dell shipped it to me. I did get a new 750w power supply though. Anyway, when I was rendering a video in a video editing program, the computer roared the loudest I've ever heard a computer sound, like a jet taking off.  It kind of worried me. When I looked at the CPU core temperatures (with CPUID), they were going as high as 99 °C. Is this normal? Or dangerous?

When I went into the Windows advanced power settings, in 'Processor Power Management' I saw that the 'System Cooling Policy' was set to "Active" and the 'Maximum Processor Rate' was set to 100%. I changed them to "Passive" and 90% and it was better - the temperatures didn't go as high and the computer didn't sound as loud. If I don't want to upgrade the fans/cooling system, was that the right way to control the CPU temperature? Or is there another/better way? Did I basically "under clock" the CPU by doing that?