**Vsync to minimising screen tear means you'll be capping to the refresh rate**
Never used Vsync yet or capped my refresh rate, my Samsung 971D refresh rate is set at 85HRTz. If the game options allows me to set the refresh rate l'll set it at 85HRTz.
I play old as well as new game's, yes some games don't support SLI, but on the whole my SLI 670 have never gave me any trouble BF4, Ghost, BOPSII, COD Series, Need For Speed Series l could go on.
Regarding **frame limiting**, not to sure what you mean by that. Do you mean limit my FPS in a game no l'll set that to Unlimited-BOPSII or what ever the game max will allow.
Have gamed with a single 670 then added the 2nd 670 and it does make a difference. Everything is just that bit smoother never had any of the problems regarding BF4 lag etc, Ghost, a bit mouse lag change settings. Just the first few days when people are downloading the game or the hosts connection or laggy players.
You'll have to excuse me lol l'm nearly 60 and not quite up to scratch with the jargon . Still get myself mixed up with certain things, the nearest thing to a PC or calculator was your fingers and toes in my school days..
Still learning something everyday.