Will I be able to fit two of these graphics cards in SLI?

That would depend on the layout of the motherboard, and I would not advise it either way, as you'd have to put the cards back to back if it could fit in most cases. You'd be better off getting cards with 2 slot coolers for extra breathing room, and in the end, they'd stay cooler for it as having space between them will help more than the extra slot worth of HSF.
 
Even with mobos eatx with 4 pcie slots it's really hard to do sli with the asus triple slot, that card was meant to go single and as a single card it's one of the best, also to be honest you could get just two evga 670 gtx ftw and save some money, you'll get about the same performance.
 


I definitely prefer this option.

Btw, what is the monitor setup for this system?
 

ambam

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I have a single 27" 1920x1080 monitor.

And from my research the MSI motherboard has more features and is higher quality than the ASUS Sabertooth Z77.

It has built-in wi-fi.
 

ambam

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Maxing out games like Metro 2033, Battlefield 3, Crysis 2 and 3, Far Cry 3, the PC port of GTA 4, and several other games requires brute force. At least two flagship GPU's from AMD or Nvidia are required to play these games smoothly at max settings, even at 1080.

I may upgrade to a 120hz monitor in the future.
 
I thought you had a triple monitor setup or a 1440p monitor, for 1080p two 680 gtx is a waste, just get two 670 gtx and you will have ~120 fps @ 1080p.



http://tpucdn.com/reviews/NVIDIA/GeForce_GTX_670_SLI/images/crysis2_1920_1200.gif
http://tpucdn.com/reviews/NVIDIA/GeForce_GTX_670_SLI/images/bf3_1920_1200.gif
http://tpucdn.com/reviews/NVIDIA/GeForce_GTX_670_SLI/images/arkhamcity_1920_1200.gif


Even two 670 gtx in SLI is overkill for 1080p and no difference between two 670 gtx and two 680 gtx in SLI.
 

ambam

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Yes, but 120hz monitors are extremely costly, usually over $350.

Also, I feel bad about downgrading the size of my current monitor. I don't know of any 27" monitors with a 120hz refresh rate.
 

ambam

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Thanks for those recommendations. I'll probably get one of those monitors as soon as I can afford it.