It is very much depending on the games you run and the monitor you are using.
I would say your 2gb will be running out of juice if you are playing on a 1440p monitor and on ultra settings. Furthermore you will need a bigger wattage psu.
Sli also not worth to go for dual 760.
You will need a z87 z97 mobo to do the job that gives you dual cards on x8 x8.
Even a single 770 is able to run quite a few games at 1440p ultra.
Maybe it's because I'm not fussy - ran BF4 at 1440p ultra with my ASUS GTX 770 and it is very much playable. Sure it would smoother with a 780, but this shows that a single card is more than capable of running a single display set up.
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