I have a 3900X + 2080 Super and my BIOS (latest for ASRock X570 Phantom Gaming 4) does have options under PCEI to enable "4G Decoding Support" (necessary to enable Rebar it seems) and "Resizable Bar" itself. Now, at the moment at least (and who knows, maybe forever) 2000 series GPUs do not support Rebar, but -- my thought was, if it didn't hurt anything I could switch it on and maybe down the line if its enabled in the driver on Nvidia's end i'm ready to go. That said, I'm also not sure if turning it on for cards that are unsupported would have negative side effects. I did turn it on initially just to check the latest driver for support, but I suppose now I may as well turn it off for the time being if it could cause issues. Thoughts? Would there be any advantage in leaving the 4G decoding and/or Rebar enabled or should I just switch them off for now? Thanks!