RX 480 replacement for x99 Mojave’s

Hi all I bought a used rx480 for my Hackintosh x99 strix 16gb ram and 6800k

I was getting random lock ups so after hours of testing I tried my you in another Hackintosh and it crashes exactly the same. So I have determined it is the card.

I need to run a 43” tv at 40k 60 through hdmi 2 so what would your recommendations be. I would Like something that works oob

Thanks