13.8 drivers are better. It's definitely not "a thing of the past", much like the stutter introduced with 12.11.
Even a GTX 690 microstutters if you want to go there. Is it a problem though?
Yes, actually. Yes it is. That's why people recommend single card setups. And SLI is still better than CFX in terms of frame pacing.
And anyone still complaining about the difference is just being pedantic. Realistically, nobody's going to be able to notice the difference. For all intents and purposes, CF is just as usable as SLI is now.