Just posting back about a comment/question I made a couple of weeks ago regarding whether or not 8GB ram would be a bottleneck for this card as I remember seeing on the Nvidia site 16GB is recommended.
Well over the weekend I just fitted some new 2x8GB Avexir DDR3 memory and there is no difference from my early tests in Assassin's Creed Black Flag for example. I was getting occasional stutter in that game and thought 8GB might of been the cause, I guess it's either just a game or driver related problem but running Black Flag at 1920x1080 with everything at very high, SMAO, shadows normal, Physx off I expected a smooth 60fps but for some reason this is not the case.
Perhaps I was expecting much greater performance from this card.