I can confirm that a GT710 with uefi vbios is now also working and can access the R12s latest bios v1.1.10. Thats what im currently using for the R12. I'm also using a i3 10105 as a cpu in it, so can confirm that works as well.   [URL]
There are plenty of R10's and R12's being sold on ebay without their gpus. They have reasonable enough cpu specs given that they are f sku cpu's with no mobo video out anyway. My plan is to get and use one of these machines and run it as a home-server hosting a few services I currently run on much lower end hardware. My main concern is the Alienware mobo giving POST issues when booting with no gpu. I'm hoping they'll pass POST and boot into the OS (win10 or linux etc.) successfully.   Has anyone else attempted to do this? Or have a machine they're willing to take the gpu out of and test to see if it can successfully POST & boot anyway?
Run R10/R12 as headless server without gpu