The odd thing I noticed about the 460M on my machine is that regardless of the game, I hardly use more than 400MB worth of the Vram that's provided. Crysis was the only game that went up to 450MB. Is this due to the 1680x945 resolution that it's set at rather than 1920x1080?
I just don't see how 1.5GB is needed for a card like this. Though I suppose it does help a bit when you have two cards in SLI for any laptop.
The image provided clearly shows the amount of Vram dedicated to the card only. I have mine overclocked a fair amount. By the way, the 460M is what we had expected out of the GTS 450.
I'm guessing the large amount of VRAM is for the marketing people to help them sell more laptops and pitch them as "gaming" laptops.