100 degree cpu temperature on liquid cooled aurora r12

it doesnt sound normal I'm afraid, my i9 11900k on R12 reaches ~75 max under heavy load.

Please contact support and hope you get it fixed

This is not normal and would indicate some kind of issue with your AIO liquid cooler, or the installation of it.

Is the top fan running when this is occurring? It should become very loud at those temperatures.

It's possible you have a silent fan profile set with Alienware Control Center.

If you go to this page and select "Diagnostics & Tools", you should be able to run stress tests that will also detect any hardware issues you might be experiencing.

"It should become very loud at those temperatures"

Yes, it should sound like a jet engine about to takeoff. Check and see if the fan from the AIO Cooler is plugged into the motherboard.

it goes to 100 degree even in performance cooling mode, and fans spinning like jet engine

my guess is that the thermal paste is poorly applied in factory...

i am not sure if technical support can help me with that, since it is quite difficult for them to re-apply thermal paste

For a DIY builder it's pretty easy reapplying thermal paste but it's more likely the AIO cooler is not seating correctly on the CPU. Even so, once you lift the AIO housing from the CPU, the thermal paste will need to be reapplied.

If that's something you are not comfortable with, you'll probably need a service tech to do that.

Your best bet is to contact DELL technical support and get this fixed up for you.

You don't want to run this an extended period of time at those temperatures, as it might damage the processor over prolonged periods of time.

It's not normal for sure, and besides a bad thermal compound application or incorrectly seated coolant pump/heat sink assembly, it could also indicate a faulty pump on your liquid cooler or another problem with your AIO liquid cooler.

It's really something you would want to get fixed.