You mean "not use it because it's prohibitively expensive"?
If that works for you, then fine with me...
Yes, for now! Both nVidia and AMD are working on drivers to do the same job as Virtu, adapted for their graphics cards.
See the answer above.
- Most Gigabyte cards come with neither video outputs nor Virtu support. It's not clear yet whether the video card manufacturer's drivers will work with these, but I don't think so because I don't think the chipset has connection to the iGPU.
- Asus will release some cards without video connector but with Virtu support. These will definitely be able to use QS.
That's correct. Only bords with an H in the designation, like GA-Z68-UD3H-B3, have video ouputs (and support Virtu).