The i5 isn't ancient and will do fine.
For GTA you need to find reviews on the 1050, 1060, 1070 or maybe not. If budget is the issue, how far can you go up?
So I have a real meme of a rig.
NVIDIA GeForce GT 640
Intel Core i5 4570S
Both of which are fossils. I'm trying to run GTA 5 highest settings with a consistent 60fps for the cheapest amount possible ('cause I'm poor).
What should I invest in? Also idk what contributes to the FPS so here's my other stats just in case:
Intel Core i5 4570S @ 2.90GHz 41 °C
Haswell 22nm Technology
8.00GB Dual-Channel DDR3 @ 665MHz (9-9-9-24)
ECS B85H3-M (SOCKET 0) 35 °C
2047MB NVIDIA GeForce GT 640 (EVGA) 33 °C
931GB Seagate ST1000DM003-1CH162 (SATA) 38 °C
HL-DT-ST DVDRAM GSA-H62L
Realtek High Definition Audio