Radeon 460?

Hi guys!

So I had a golden build with the following (really old) parts:

 CPU: intel i7 - 950 GPU: ATI Radeon 4850 (512 MB) RAM: 18GB MOBO: Pegatron IPMTB-TK 

I tried to upgrade my GPU to a MSI Radeon 460 (2GB) but unfortunately half way through the Apple loading screen my computer is sent back to the MOBO boot screen. I am looking things up all over the place but there seems to be little documentation on this GPU on High Sierra. I have tried changing the Fake ID, but I am really new to this so I am really unsure what to do. I have been trying a bunch of different multibeast configurations on flashdrives to try to boot into my machine but I still cannot get past the apple loading screen.

Does anyone have any idea what I can do to fix this? Thank you guys so much!