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This seems to be just a guess based on past experiences with UEFI. From what I've noticed, it might relate to a mismatch in secure boot keys or an issue with the system. You might try resetting the secure boot keys, which could resolve the EFI problem with the GPU. Sometimes adding a key during the MOK process helps, though it doesn't always succeed. Resetting the keys may be necessary if you need to reinstall Windows. This approach could work as a last resort while others find better solutions.
The 1660 Super works well with UEFI systems. Before using it, clearing CMOS typically involves removing the battery, disconnecting from power, and then reinserting it. Alternatively, you can jump the pins to reset it. If neither method helps, further checks are necessary as another part may be faulty or the board might have been disconnected improperly.
The system starts up but doesn’t show any correct information. If CMOS reset fails, proceed by checking other parts, removing unused items like RGB strips, storage drives, etc. Only keep essentials for posting. Verify power cables from PSU to motherboard and GPU, clear one RAM stick at a time, and try posting again. If it still doesn’t work in the simplest setup, reinsert all components carefully. Then test CPU, GPU, RAM, power connectors, M.2 SSDs, etc. If nothing changes, replace or test new parts one by one. If you prefer not to fix it yourself, consider having a professional inspect it.
It seems like a CPU works well but isn't ideal for troubleshooting. You'll need to change to a GPU or use an older CPU with graphics capabilities temporarily to fix or replace the motherboard, letting someone else handle the rest.