SkyNetRising
Titan
You said, you had i7-10700k and a different system before.Ok unfortunately disabling the e cores didn't help at all. Cpu usage is still jumping from 30 to 90 every second. And temperature often jumps from 50 to 75. Also game is lagging very heavy.
Did you reuse OS drive from this previous computer?
Motherboard change often requires reinstallation of windows, to run properly.
Did you reinstall windows?