Quick newb questions!

Broke dude on a budget trying to rig up a quick jellyfin server out of garbage!

Here’s the GPU:


Radeon r9-280 3gb gddr5

1st question: yay or nay on plugin that big ass chromax on there?? Sufficient ? Ideas on placement ??

2nd question: with old i5-46??? (Who cares lol) 700w PSU, buncho hard drivezzz would it live convert 4k h265, av1?? Or am I dreaming in technicolor and would need to content with 1080p

Thanks my good lords of true nerdiness!!!