Does my GPU/system support BenQ xl2420z 144hz monitor?

[SloopsTheGreat]

http://pcpartpicker.com/p/kT8ZrH
I have a 2 way SLI gtx 970s for my GPUs but I can also choose 1 GTX 980. I'll only be using one monitor so which one is better and which would support 144hz monitor better?
Thanks in advance

 

[Xyos]

The SLI 970's will give you better performance compared to a single 980, and yes your system does support 144hz. It all depends on the game though. Many games are capped at 60 fps nowadays (making 144hz useless), but some do support over 60.

 

[SloopsTheGreat]

The SLI 970's will give you better performance compared to a single 980, and yes your system does support 144hz. It all depends on the game though. Many games are capped at 60 fps nowadays (making 144hz useless), but some do support over 60.

Ok and can you explain to me how SLI works? I don't understand it. Does it make sense to run 2 GPUs for one monitor?

 

[Xyos]

It does not make sense if the monitor is 1080p. A single 970 or 980 will easily run any game at 1080p on a single monitor. If you are doing 1440p/4k/ or 3 way surround then yes you will need SLI to get good FPS.

SLI essentially splits the load of rendering a scene. A single frame is split in 2, one card rendering a 1/2, and the other card does the rest. It can also work by "alternating" frame rendering.

2 way SLI usually gives you good scaling, as in an almost 50% increase in performance, but after that you get some real diminishing returns.