I got replacement motherboard and after change it I got much better results, however CPU still raised to 100C on one core. I have also ordered new heatsink - will try to replace it with PTM7950 or Thermal Grizzly LM (I have some left from previous Razer Blade 15 application).
What’s great now - on stress test I got 50-54W continuous power now instead of 37-39W on previous motherboard.
CPU-Z OLD: AMD Ryzen 9 7940HS @ 4467.47 MHz - CPU-Z VALIDATOR
CPU-Z NEW: AMD Ryzen 9 7940HS @ 4638.9 MHz - CPU-Z VALIDATOR
Cinebench for new after ~10 minutes (note all cores 80-90C and only one 100C with 53W - I got 15244-15697 score now, instead of ~10k before):
UPDATE:
After ~hour the Core having 100C temps go down - maybe LM have to settle like PTM?
CPU-Z: AMD Ryzen 9 7940HS @ 4689.93 MHz - CPU-Z VALIDATOR
