A:Answer The PC isn't the issue as far as the TV goes but if your going to do video and Photo editing you'll need all the horsepower you can get.
I Have a Quad core Intel I5 running at 4 ghz with 32 gbs of ram with the newest Geforce 970 video card and it still takes a few seconds to fully load RAW files on the screen in Photoshop.
So it's a bit of a loaded question as to "minimum pc requirements" for what you want to do.
I would recommend checking the recommended computer specs for whatever software like Photoshop, etc., that you are going to use and start from there.
But that being said, I'd at LEAST get a computer with 8 gb of ram, an Intel I5 quad core processor, and a 1tb hard drive with this caveat; you need as much ram as you can afford and you'll eventually need more hard drive space.
As far as this TV goes it makes an excellent computer monitor; That's what I am using it for.
If you not a gamer and don't mind a slightly slower mouse response you can get away with any video card that has HDMI 1.4 and will do 3840 X 2160 @ 30hz.
However, if you want as smooth an experience that you'd get with a smaller, say 1920 x 1080 monitor, then you'll want a video card that has the new HDMI 2.0 spec and will output 3840 X 2160 @ 60 Hz.
Unfortunately there's only two cards out right now that will do that; The nVidia Geforce 970, and 990 cards.
The 970 is between $320.00 and $350.00 depending on whose card you buy.