I have a pentium 4 e5200 igpu, and i want a polaris card so I can game at 1080p 60fps high-max settings. It'll certainly be a big jump.
edit:
tbh it won't be that big of an upgrade.
link for my gpu vs rx 480.
http://gpu.userbenchmark.com/Compare/Intel-Q45Q43-Express-Chipset-vs-AMD-RX-480/m8195vs3634