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Slap a 280mm AIO on it and chill out.
If your CPU is running hot, as you say, 'undervolting' is not your first answer. Better cooling is?
The third action on your list should be: cap the framerate. No game needs to run uncontrolled in full speed. I have all my CPUs capped. None of them run beyond 90%.
Manual undervolting - done right - does not 'reduce' the performance, but rather increases the optimal 'use' of existing performance ... while drawing less power. It takes time and patience to tweak the CPU/GPUs to an optimal setting. The upside though is: experimenting with 'undervolting' will not damage your hardware (unless, you do something terribly wrong). "Undervolting" (= less power) will just shut down your PC and - in the worst case - you have to reset your BIOS (CMOS swap).
I'd set all the p-cores to stay at something like 5.5 to 5.8GHz with as low voltage as possible. 90C or less in cinebench r23.
My 12700K can be undervolted by -0.90 whilst getting the same stock core/boost speeds. Even have it undervolted a little whilst boosting to 5Ghz on all P-cores.
My GPU is undervolted with a small Overclock and fans never hit 70% Rpm
My 4790K could be undervolted by -0.145 with a slight overclock
It's going to crash but only until you identify how much of an undervolt it can handle. That means you have to try it and that'll cause crashes and then you reduce the amount you're undervolting it by.
You should really do stress tests to make sure it's stable but if you feel it's ok run it as it is do so and IF it crashes when your system wouldn't normally reduce the undervolt.
Start with a -0.050 undervolt and if it runs stable change it with 0.005 increments to -0.055 then -0.060 and so on. When it crashes adjust it to lower the undervolt. If it starts crashing when you hit -0.080 change it to -0.070 and see how it goes. If you still get crashes change it to -0.065 and try again
make sure the pump is always at 100%
and set the rad fans to cpu temp, 0% at 60c to 100% at 80c
the cpu block will always have cool coolant in, and when loads spike the pump will not have to change the flow of the entire loop
undervolting uses overclocking rules
tweak test and repeat, write down results
temps low and stable = raise cpu multi
temps low and unstable = raise core voltage
temps high and stable = lower voltage
temps high and unstable = go back to last stable and stop, or lower oc
I followed some videos on Youtube and eventually used intel XTU to under-volt.
Using XTU makes it extremely simple and it lowered the CPU temperature by a very significant amount. I didn't even bother to reduce the voltage to where it was crashing, I just reduced it to where it was running at a much better temperature. In my case it lowered the temperature by 9 degrees.