well if peeps are wrong and your cards and monitor run out of vram on 4q new gen of games , what then ?
if I could of had more vram on my 780 I would have got it. but nv vram gods \[marketing] made sure that my sli gets updated before its time just the same as my 8800gts sli ,gtx 285 sli , and my 580 sli.
-note no 780Ti sli in my sig. same vram .cost $500.00 more no big deal but same vram no way.
get the 4 gb cost today will let you keep your cards for a extra year imo.
you forgot this part
Theres certainly a market for these 4GB GTX 770 cards but their true benefits
will only be realized in very specific games that are either poorly optimized or have been modified to require an obscene about of memory.
and that could be every game you buy in 2014-2015
or today
http://forums.anandtech.com/showthread.php?t=2369254