Finally found a great gpu! Paid 600 for it but whatever, I needed it. It's a Sapphire Nitro Radeon RX 580 8GB Special Edition. It performs AWESOME! I'm playing NFS Heat at
Sapphire Nitro RX580 8GB Mac Pro EFI boot screen Metal 4K native Mojave Monterey | eBay
Sapphire Nitro+ RX 580 8GB: Sexier with a White Shroud : r/pcmods