Hello all, I just upgraded the pc from Gigabyte Gaming OC 4090 to a MSI Suprim SOC 5090 (Gaming Bios). How can the results get worse?!?

Graphics driver is a clean fresh install.
CPU is the same.
Power Limit in MSI Afterburner is already set all the way up to 100%. I changed nothing in MSI Afterburner.
PSU is 1500watt. Unchanged.

Appreciate your help!