7970 vs gtx 680 vs gtx 670 at 2560x1440

[Nguyethe]

I know there's been a lot of topics on this but I'm not sure how big the difference between these GPU's are at that resolution. I'm also running another 1080p monitor to the side.
I'm planning on adding the videocard to my watercooling loop as well as overclocking it. I plan on playing games such as BF3,Guild Wars 2, Diablo 3, and Crysis 2.

My computer specs are:

CPU - 3770k 4.7ghz
RAM - 16GB Kingston HyperX 1600
PSU - OCZ ZX 1000 watt
Case - 700D
Motherboard - MSI Z77A-GD65
HDD - Crucical m4 128gb/ 1.5TB Seagate/ OCZ Vertex 2 60gb
Monitors - Nixeus Vue 27" 2560x1440/ Asus 23" LED 1080p

 

[Nguyethe]

Thanks and my other question is If in the future, if I try to add another 7970 will a xspc rx360 be able to cool both of them ? I also have a d5 pump.

 

[Nguyethe]

Best answer selected by Nguyethe.

 

[jacknhut]

Thanks and my other question is If in the future, if I try to add another 7970 will a xspc rx360 be able to cool both of them ? I also have a d5 pump.

XSPC RX 360 won't be able to keep up with i7 3770k and 2 HD 7970. You need a 2nd radiator ie XSPC RX 240mm to keep them cool.