Looking for opinions on upgrading my gaming rig

Jezerton

Honorable
Nov 27, 2013
16
0
10,510
Should I upgrade just my GPU or should I go ahead and upgrade my motherboard and CPU as well as my GPU?

I'll be using this for gaming. ArmA 3, Fallout 4, MGSV and many upcoming titles (Just Cause 3, Doom etc).

My specs:
CPU - AMD Phenom II X4 970 Black Edition (3.7GHz)
Motherboard - Asus M5A97 EVO R2.0
GPU - ATI Radeon HD 5870 Black Edition
PSU - Cooler Master V850 (850W)
Resolution - 1920x1200

What would you do?

Thanks for your opinion.
 
Solution
I would go ahead and upgrade all of it. The power supply is good though, but probably getting a little old. And note it may not be able to support the Haswell sleep states.