best video card features for fast Movie Render Queue Renders

A topic appropriate to the Radeon launch today. If my goal is to render a video file as quickly as possible, I assume the workhorse is the video card and not the cpu. (Let me know if that’s wrong please!) What feature do I want in order to render videos most quickly. VRAM? Cuda Cores? Encoders? Drivers? I got about a thousand bucks to spend but if I can get the price down, then I’ll have extra money to buy other stuff.

And if it matters, I’m going stylistic, not photorealistic. Graphics on the level of Borderlands with a fair bit of post processing. I plan to use Lumen and would like a bit of hardware ray tracing. Not a huge number of effects.