would be a more robust GPU and whatever PSU it takes to support it.
Take a look at the link below and see what'll give you a GPU bump.
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html
VAPCMD
Hi,
First time writing a post... I'm sorry if the question already exists.
I'm getting a lot of issues with my graphics card failing and my system is running a little slow. Sometimes it resolves itself, however a lot of the time I need to fully reboot my computer. I get the issue most while playing games (BF4 specifically).
It's about 2 years old. I'm currently running RipjawX 8gb DDR3 RAM, a GTX580 (with the most up to date driver), intel core i7-2600CPU @3.40GHZ, and a gigabyte GA-Z68XP-D3 mobo.
(Also running a 2TB HDD and a SSD too).
My plan was to just buy a new GPU and another 8GB of RAM.
Just wanted some peoples opinions on if I should buy the new parts or build a new system?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic