I would like to see 8GB RAM and the CPU is fast enough for those games. The GPU is what needs updating. I like this list:
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html
The 650 was a bit of a power hog so you may be good on the PSU.
Bob
I'm a PC gamer. I have this current build, but would like to save as much money as possible. I need to upgrade my everything, (except RAM) but im not really even sure what to get that would work very well to run my games at the max settings fora decent price. (Games like GTA V, Battlefield Hardline) Here are my currents Specs:
Intel Core i5 650 @ 3.2 GHz (4 CPU's)
Geforce GTX 650 2GB Asus Edition
8GB DDR3 Ram
I have whatever the default motherboard is in the late 2009 model of the Inpsiron 580.
http://www.dell.com/support/home/us/en/19/product-support/product/inspiron-580/manuals

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic