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Question GTX SC 6GB 780 Not Working Right

Jul 9, 2020
Hey. I have 4x GTX SC 6 GB 780 cards which one of them works perfectly fine. One of them has glitchy graphics on the screen, like greenish pixels. All 3 of them post and boot up to windows, after that (few mins) they all seem to crash and have no display out put and sometimes go into windows recovery mode. All have been cleaned out of dust and the fans still spin on all of them. Wondering what the issue is here. I have also flashed all the bios on the cards to the current one : https://www.techpowerup.com/vgabios/159581/evga-gtx780-6144-140411

System build is i5 9400f, 16 GB drr4, 550w psu. Psu shouldn't be the case because one of the cards work perfectly fine and in games for long periods
I also have good air flow in the case and the system isn't the problem as it runs my 1070ti well.

Any help would be helpful thanks.