Ref: https://www.schoolofmotion.com/blog/graphics-processing-after-effects#:~:text=While%20a%20graphics%20card%20will,card%20or%20GPU%20within%20it. https://www.youtube.com/watch?v=noD5vVHhF9Y suggested are AMD Ryzen 5000 or intel core 11 th gen for budget rendering. AMDs are better with after effects as told in video. Intel has quick sync which is best fr adobe premiere pro. for rendering after effects video good memory is better. 8 gb minimum and 16 gb recommended and 32GB 64 GB depending on the project for h.264 and havc media. then CPU. Then on board or on chip GPU then external GPUs Vram will increase 50% sped but base GPU to high end GPU difference is very minimal. for GPU RTX 3060 or 3070 is enough to gain up to 50% speed.' for time critical rendering AMD Ryzen 9 5950x is best.
