I have an OMEN 15 with a 10750H, 3070 Max Q, 32gb 2933 cl17 2rx8 with TB3. windows 10 and 11 have the same issue.
I know it can work with ePGUs since HP made an OMEN eGPU a while back, and the fact it comes up and give me video out. But even with 50 to 60% CPU usage, I cant get more than 40ish%...