Should I upgrade my i7 860 or GTX 950 2gb?

Snoop2069

Commendable
Feb 26, 2016
3
0
1,510
My specs are:
i7-860 2.8Ghz
EVGA gtx 950 2gb SC
16gb ram
1tb hard drive
EVGA 500watt non-modular psu
dh55tc lga1156 motherboard
Enermax Thorex Mid Tower

The AMD RX 480 just came out, and it seems pretty good (I'm interested in the 8gb version). My CPU also needs an upgrade, as it's a 1st gen i7. Which should I upgrade?

I'd be willing to spend $250 on the new cpu/motherboard