Geforce Titan - GK110 will be a consumer part

[zalbard]

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.

AFAIK there is no accurate way to measure how much VRAM a game "needs" to run well at this point in time.

Precisely.

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.".

Unless you have to resort to slower memory chips, it's definitely not worse.