Questions about a new pc.

[Beoron]

I have another question, is it helpful to run a higher internal resolution than my monitor can support? My tv does support 4k resolution so I might see how well I can run that, but I wonder if it will look different on my monitor which is 1080p. Also, are any of the post processing effects worth using? I have a 970 GTX and am wondering if there are any of those I can try that wouldn't slow me down too much.