Before release CP2077 2.0 and PL please check conditions of your cooling systems in PC. We use all what you have, so workload on CPU 90% on 8 core is expected. To save your time please run Cinebench or similar and check stability of your systems
In other words: CPU load will increase, overclockers with unstable clocks will be more likely so see crashes.
No need to check your cooling, CPUs will be plenty stable unless you messed with your clock speed without significant stability testing.
The game will actually use all of the CPU cores without mods now. The lack of SMT support has been fixed, that sounds like optimisation to me. Currently, the game is struggling to use more than half the available CPU power available on some systems.
You can still artificially limit the CPU to only half your cores, of course (by setting the task affinity for the game process)