Hi, Thanks in advance for any help. I have a 2009 Mac Pro -> 5,1 and upgrade CPUs running OS X 10.13.6. I wanted to upgrade my video card. I have tried the Vega 56 and now the Sapphire Nitro RX 580. Using both Aux power ports. These were my results:
When I tried the Vega, it booted fine, BUT NO VIDEO. Thinking it may be a bad card I returned for a replacement and am waiting on that. Resigned to save for a PC build.
So I then purchased the RX 580 (nice blue card)! When I installed the card I get nothing. Just a click from the PSU and that’s it.
So I put my stock GT 120 card back in and everything is fine. Boots just fine. I tried the RX 580 again in the other x16 slot. “Click” was all I got. GT 120 back in boots fine.
I almost think it is a PSU issue; that maybe it is not putting out the power needed. The voltages on the aux ports is fine, but I have no way to test with a calibrated load to see if indeed the PSU is putting out the power it is supposed to.
Any thoughts? Am I doing something wrong or forget to do something?