I have an AMD RX570 and it needs an 8 pin connector to run. I don't see any unused connectors whatsoever, all of them are in use.
Here's my PSU for reference:
https://www.foxin.in/shop/foxin-200-watt-12-volt-smps-with-204-pin-fps-500s/
Here's my PSU for reference:
https://www.foxin.in/shop/foxin-200-watt-12-volt-smps-with-204-pin-fps-500s/