Well, it's pretty simple to me.So what are the cut off points? How old/new does a card have to be before 4GB is either fine or not enough.
7970 -> 290X = 37.5% more shader cores and 33.3% more VRAM; good balanced ratio
680 -> 780 = 50% more shader cores and 50% more VRAM; good balanced ratio (though both amounts are actually insufficient for their respective cards' power at the time of their driver-optimized peak, imo and experience)
980 -> GM200/"980Ti" = 50% more shader cores and 50% more VRAM; good balanced ratio
290X -> 390X = 45.5 % more shader cores and double the bandwidth and ROPs with massively improved tesselation and color compression, but 0% more VRAM; WTH?
It's like if Nvidia decided to keep the 980Ti at 3 GBs like the 780Ti or had somehow, without destroying the memory bus, kept the 780 at 2 GBs like the 680. Or if AMD kept the 290X at 3 GBs like the 7970, which undoubtedly at this point in time would already be limiting for its capabilities (would have been last year even).
Why more than 4 GBs for the 390X is simply because the card is powerful enough to easily make use of more, especially in any crossfire configuration. AMD are going to push it as a high resolution card, or multi-monitor, or it's going to excel at processing AA, or some other nice and demanding settings that demand both VRAM and power. If you just want one to drive a higher FPS display (like 120 FPS) at similar settings to like a 980/290X, then the extra VRAM isn't really necessary per se, but it's simply not a good match for this, what, 8.5 TFLOPs monster we're talking about? The PS4 has more potential VRAM for Pete's sake and a GPU barely 1/5th as powerful.
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