Anyone who buys a graphics card based on how much memory it has is going to be disappointed. It's _way_ cheaper to chuck mediocre cards out with lots of RAM than it is to produce good cards.
Benchmarks, benchmarks, benchmarks, people. Don't look at what it is called, or how much memory it has, look at what it _does_. I'm talking about real world gaming benchmarks here, not 3dmark or anything. And yes, they do manipulate these a bit, but it's much, much harder to manipulate them.
All that being said, this is a shitty move by nvidia.