Recently got a HD 7970 Matrix Platinum. Figured it's not too rare, but still, it was listed at the start of the thread
Too bad it artifacts weirdly, under load only. Occasionally, it'll just blackscreen and never recover when watching a video or messing about on Discord. Dying chip? I've tried underclocking/overvolting it (vCore, vMem, and VDDCI because that's an option in GPU Tweak II), reflashing the original BIOS, trying two different driver versions (19.2.2, 18.2.2) with DDU used between them, and doing a full cleaning (so dusting/repasting and making sure there's good contact). Oh, and swapping my PSU for a higher power one (though it's dedicated to the card only).