depends very much as example if you want to play only with 1366xwhatever, 1080p or if you want to play higher than 1080p. and also how many fps are enough for you.
i saw some benchmarks with gtx 680 and 690 and differences between both weren't very huge up to 1080p but with 1600p there was a big difference.
€dit: ok now i saw some other benchmarks on another site and there is already a big difference in fps with 1080p between gtx 680 and 690. now i have no clue what's correct^^ but one is for sure above 1080p you definately have a huge advantage with the 690.







