Will a gaming pc with a 4K graphics card be necessary for just Video VR streaming and usage?
I'd say it is likely based on the fact that VR video will usually require additional data. Instead of sending a single 1080 x 1920 pixel video stream, you may be sending much more data. Currently, most 360 videos on the web use 4K resolution (3840 x 2160 pixels). That’s four times more data than 1080p HD.