NVIDIA GeForce GTX 1050 T1
BTW, I am thinking of making my main Win7WM headless by installing a spare Ceton Echo in my living room where we have traditionally used the PC directly. I have three other Ceton Echos around the house already. While the fast forward and rewind aren't nearly as snappy, it solves multiple issues with the GPU, this new framerate problem being the only one without a work-around. But I also wouldn't miss having to re-sync (via HDMIYo) when I change inputs on the HDMI switch and get a green screen related to PlayReady, nor the occasional grey screen when the HDMI switch doesn't recognize the PC input.
The alternative of finding an NVIDIA video card for the motherboard would itself not be a big challenge, but I don't think I have the latest supplemental power connector on the power supply - although it is a Corsair modular power supply, so I might be able to order one. [EDIT: I just realized the same NVIDIA GeForce GTX 1050 T1s as in my Win8MC are still available direct from Amazon for $150 and don't need external power.]
This PC <cough> was/is supposed to be retired when the SD DVR supports DRM, as that has been the plan since the original SD DVR Kickstarter to which I contributed...