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Thanks Maxxx, also fixed the problem for me!

EDIT: Turns out the problem was CFG Lock, I'd previously removed it in BIOS firmware but hadn't thought about it getting turned back on when I updated said firmware :crazy: Also, I'd gotten AppleCpuPmCfgLock and AppleXcpmCfgLock mixed up, having enabled the former and disabled the latter. Should...

FIXED! Turns out my previously-disabled CFG Lock was re-enabled because I upgraded BIOS firmware. Also, had set AppleCpuPmCfgLock instead of AppleXcpmCfgLock by mistake, thanks @Hecatomb! Both are disabled now as I've patched CFG Lock manually in BIOS firmware. ------ Hi all, I'm attempting...

Thank you! @etorix has also suggested a new RX 6600, which I am now considering. The missing XT might not be a huge issue for my working conditions.

Thank you, that makes me feel much better. And thank you for the great reply, super detailed and all the info I could hope for! I'll try and reply as thoroughly as I can: I do some 3D, but it's Rhino stuff and not much rendering, so that's not going to pull any teeth. I do video editing and...

I've managed to find the following used cards: $333 Powercolor Rx 5700 xt Powercolor, 8 GB $300 ASRock AMD Radeon RX 6600 XT Challenger D 8GB (seller has 4, probably miner) $230 Powercolor Radeon RX 5600 XT 6GB (seller looks sketchy) $230 Vega 64 (water cooled?) 8GB. No info on manufacturer...

Hmm, did some more digging and found some threads that suggest that RX580 might not be ideal for 4K. I'll see if I can find something else at or below $300 that might pull dual 4K more efficiently.

Thank you for the suggestions! I'm afraid those are all out of my price range, which I should have mentioned. I can't spend more than $300 at the moment, and used RX 6800 cards are hovering around $650 here in Denmark at the moment. I've done some digging, and have found a few people with...

Hi all! A pre-emptive apology for the wall of text, I'm trying to be as detailed as I can about my situation, partly because I'm very much outside my comfort zone with having to update my beloved hackintosh, and partly because I'm pathologically bad at being succinct. I hope you'll forgive me...