If your PS4 Pro is beginning to sound like a jet engine taking off then it’s worth doing a couple of things. One is clean the fan and CPU heatsink. Other is to see if you have a Delta fan (noisy) or a Nidec fan (quieter). If you have the Delta fan then it’s worthwhile searching for the Nidec fan as it is much quieter and more efficient. The noise from my PS4 Pro has reduced dramatically due to several factor. Cleaned the heatsink. Reapplied better quality thermal paste and changed the delta fan to the Nidec fan. Overall very pleased with the difference. So if you can, check your fan and if you have a delta fan change it for a Nidec.