Again, it doesn't tend to manifest itself in a FPS capacity in most cases. It is hitching that can sometimes show up. And when it does, it really detracts from the gaming experience and immersion. We have a thread here from 2012 where there were already games over it, several sniffing it. It just needs to be said that IQ sacrifices sometimes need to be made when using a 2GB card, even at 1080p, for an optimal gaming experpience.The benchmarking in the reviews doesn't show much impact from RAM over 2GB, except in the most extreme testing.
There are several 'practical' situations where it is needed. We will agree to disagree.