Supported by Star Citizen? It's support directx12 and Vulkan API. https://www.techpowerup.com/gpu-specs/amd-radeon-rx-580-2048sp-8-gb.b6323 I couldn't find any official info about dx11.1 and 12.1 or ultimate support anywhere. *It's looks like interesting budget offer for upgrade of my notebook with external video card for all games. P.s.: found this video and cause game works that's mean RX 580 support dx11.1 features. As I got it, 580/590 support dx12_1 level no matter of what official description saying.