https://bugs.freedesktop.org/show_bug.cgi?id=100964
--- Comment #5 from HV suzaku.29a@gmail.com --- I tested a Seasonic 750W PSU with the RX480 but i got the same error on boot (amdgpu not loading, the rest of the system boots normally and i still get display output with nomodeset on).
Is there anything else i can test for this issue?.
Regards
HV