So I got a 280x for my 5,1 shortly after getting my Mac Pro. I flashed it with the ROM from that one thread about flashing a 280x since it was the exact same card, and everything seems mostly fine (sometimes the EFI screen won't show on boot up, but it will always show up when choosing a boot option). But about a week ago, I started getting weird 3D glitches in games in Windows where the 3D model will just expand infinitely upwards, so the model is just streaked across the screen. I also got a small area of pixelation/artifacting while playing PUBG a couple of days ago. I thought it was just Windows, but earlier today I was editing a photo in Photos.app when I saw the same pixelation/artifacting in the picture. My card is going, right? I've seen enough PCMR threads about bad GPUs to know what it looks like when a GPU looks bad, but I wanted to double check. My artifacting isn't colored, it just looks like someone took an area of my screen and made it into one of those games were you move the blocks around to get the original image. If my card is going, what card should I get? I feel like I have to go AMD since I use FCPX a lot, but the current market is, while getting a lot better, still abysmal for buyers of current-gen GPUs. I don't do much gaming, just some CSGO, PUBG, and SC2, but I would like to start playing AAA games again. My only concern is that, while I've found ways around not having the EFI screen, I would still like to have it, which really limit my options to the R9 series. I'm also, while most likely capable of doing the Pixlas mod, do not have the courage to do it, so higher end GPUs are out I think. Let me know what you think my GPU is doing, and what you have/recommend! Cheers!