Directx 12 wanted for PS beta

I have been a PS / LR user for many years as an enthusiastic amature. The latest version of PS / LR 24.4 runs very happily on my windows 10 PC with an nvidia Quadro K2200 GPU. In all respects my PC significantly exceeds the stated requirements of PS. However along with many others I am sure, I have been "playing" with the new Beta software for PS. 

The GPU compatibility in the beta app says that I need directx 12 but my K2200 only supports Directx 11. All the tech specs I can find say the the K2200 does support Directx 12. Has anyone any suggestions on this issue?

I would consider buying another GPU but I am hesitant to do so if the issue is not the card but something else or, if I buy another card, is there a risk that PS will not recognise its capability?