Which Configuration ?

[UaVaj]

hardware already on hand. i7-3770k, asrock z77 extreme4, gtx680 tri-sli
display. 5760x1080

option 1
i7-3770k
asrock z77 ws
gtx680 tri-sli (pcie 3.0 8x/8x/8x shared via plx)

option 2
i7-3820
asrock x79 extreme4
gtx680 tri-sli (pcie 2.0 8x/8x/8x dedicated)

option 3
i7-3770k
asrock z77 extreme4
gtx780 sli or titan sli (pcie 3.0 8x/8x dedicated)

 

[Sleepingforest]

...how do you already have access to GTX 780s?

Anyway, to answer your question, you should go with the two Titans on the Extreme4, assuming that price doesn't matter. The power consumption is less and I believe that two Titans scale much better than 3 680s.

 

[UaVaj]

let me further explain.

option 1
buy asrock z77 ws
sell asrock z77 extreme4

option 2
buy i7-3820
sell i7-3770k
buy asrock x79 extreme4
sell asrock z77 extreme4
once IVB-E (i7-4820K) launch in Sept 2013
sell i7-3820
buy i7-4820K

option 3
sell 680x3
buy 780x2 (in a few weeks) or titanx2

choices choices choices

 

[Sleepingforest]

I'd wait on reviews of the 780s to see how well they scale together before making an ultimate decision. We know that 680s (and really, most cards) don't scale well past the first 2.

 

[mfenn]

GTX 780's will still be Kepler, so I wouldn't expect earth-shattering increases over the current GTX 680's.