I did a clean windows installation
Just double checking, is that a FRESH windows install which consists of formatting the drive and using external installation media for a clean install? Or are you using the Windows "reset" option which restores yours system back to its default state?
I don't believe this is OS-related, but a FRESH install helps to iron out any possibility.
I'm not clear on the following:
1. Is your motherboards BIOS up-to-date? If yes, what version?
2. Can you confirm your CPU, motherboard and PSU make and model.
3. OS is fully updated via 'windows updates'?
4. Have you tried a CMOS reset? Your power consumption + 99% utilisation don't align. A CMOS reset could address potential miscommunication between the hardware and BIOS, power configurations, resource allocation, etc. Ensure your motherboards BIOS is up-to-date before resetting CMOS. Remember to enable XMP after the reset is complete.
If the above doesn't fix the problem:
5. Earlier i provided a link to a previous Version of the driver. Have you tried it? I also suggested toggling to "balanced" in the windows/Ryzen power plan to see if that helps. In addition, when downloading GPU driver, are you sourcing this directly from AMDs driver support page? Thats the only place you should be sourcing supporting drivers.
6. Have you tried reseating the GPU and reconnecting all cables to make sure everything is slotted in properly?
7. Pop into BIOS and FORCE the x16 lane (GPU) to 'PCIe'. Its usually set on 'Auto' by default. You can find this setting under something like peripherals, PCIe configuration, etc. This might help to address potential miscommunication issues between the mobo and GPU.
8. If your motherboard supports a second x16 slot, give that a try.
9. Have you tried disabling iGPU in BIOS? again the possibility of miscomms arises.
10. In addition to No. 6 - Also make sure you're using separate cables from the PSU for each of the GPUs power connectors. Avoid daisy-chaining from a single cable to ensure stability and sufficient power.