Strix RX580 - MacPro 3,1 - SOS

Hey y'all, I've got a 3,1 here that's kicking my ass. I previously had a single boot of Linux Mint on it, but after purchasing an Asus Strix 580 8GB, I powered on, the fans whir for 5 seconds or so, then stop. For about half a second, all of the normal LED's come on, then there's just a pulsing blue light that continues for as long as the system is running. Oh, the system does chime, so I suspect it's running normal but without output. I cannot find any documentation anywhere about what that light means, aside from the existence of flashing red and white critical error LEDs.

I found about about the issue with the 3,1 not having cpu architecture that supports the SSE4.2 instruction set, so I went through and made sure device firmware was up to date using the NVIDIA Quadro FX 4800 that was in the system when I got it by installing versions up to El Capitan. I then installed OCLP with Monterey.

After Installing OCLP I plugged in the 580 and while it still behaves the same as it did before, it does display the OCLP boot manager which allows me to open up Monterey, though it only progresses a third of the way before the screen goes black. However, If I stay on the boot manager, the screen doesn't black out. This makes me think that it's a compatibility issue, not a power issue.

I do not have access to another system to test the card and view its BIOS information, nor do I have another power supply to see if it's not recieving enough power; though the spec sheet does say its maximum draw is the same as a sapphire pulse... I suspect lies.

I've tried resetting the PRAM with only the bootable media installed as per the below link, which resulted in not displaying the boot manager at all. https://www.youtube.com/watch?v=p0tOmD3QEow&lc=UgzcQZ4I3t7PRbaRHuh4AaABAg.AHWCdy2fcrVAHYjPK9DZbZ

My next step is to install Linux Mint to see how far into that I can get. The plug and play amd drivers make me hopeful.

Finding a sapphire pulse or a 5,1 would definitely be ideal, but I don't think that's happening until I reacquire employment. I was specifically hoping to use AMD because driver support on linux is a lot better than nvidia atm. Any help would be really appreciated, this is meant to be a gift for my little cousin and I've been going at it for over a week now. Supposed to see her on Sunday so I was hoping to give it to her then, but that's starting to look less likely.

submitted by /u/LunalityHammer
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