Even a lower-mid-range card will give your editing rig a serious speed boost, with pricier video cards only yielding marginally superior performance. What's more, while spending top dollar on the very best graphics card will get you extra encoding performance, you really don't have to.
It's actually rather more technical than that, but the upshot is a graphics card can export video a whole lot faster than even a top-end CPU. But even with 4, 6, 8, or even more cores, a CPU simply can't match the incredible power of a graphics card, which can contain thousands of processing cores.
It used to be that video editing software relied solely on your computer's central processor (CPU) to process and export video.
