Should I even consider Qubes OS if I’m someone who likes to play games on my PC? By the way, I don’t want to dual boot.
Not if you want to use your graphics card.
Qubes is not designed for this.
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I guess it might be possible in the future, but I think that you’ll have issues with it. If I remember correctly for VFIO you need two graphics cards, one for the host and one for the guest or SR-IOV which consumer graphics cards don’t tend to have.
Or have they figured out some other way to do it?