From what I've read some will cache as much in VRAM as there is available, but having less doesn't necessarily impact on performance.
Of course, when you throw 4 and 6GB cards into the mix, more latency/framerate variation of AMD cards, variations in how well brands run individual games, the picture is a whole lot less clear than "More VRAM is always better.".
AFAIK there is no accurate way to measure how much VRAM a game "needs" to run well at this point in time.



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