OK cool,
Thanks for all the help Simon,

Yes I suppose I do not need a 4k, since I can do 1920 as a height, good call...

For the sake of argument though, if I had 3240 x 1920 or three 1920x1080 files playing, which do you think would be more efficient on the system?
I tend to think more smaller files, but I have no basis for this assumption other than I feel like larger files tend to just not be handled well by anything.