i'm a completely newbie when it comes to video editing. but i'd like to edit some 4k videos for youtube. i'm a windows user with a fairly old desktop and a surface pro 3 with an i5 processor. i have a decent video card in the desktop. not great but i can run a 4k monitor at 30hz. with video editing, is it based around my video card or processor? or both? i'm looking for a cheap way to upgrade if needed. i don't mind spending $150-200 on a slightly better video card to be able to edit 4k videos with ease.