A Titan Black is equivalent in performance to a 780 Ti as long as you stay within the 780Ti's 3GB limit. So of course two 980s are much faster as they are each a bit faster than a 780Ti.
A Titan Black is equivalent in performance to a 780 Ti as long as you stay within the 780Ti's 3GB limit. So of course two 980s are much faster as they are each a bit faster than a 780Ti.