Beware if you are on low-bandwidth connections. Here are some screenshots of different games with AA on and with AA off. I mention settings for each set. They are followed by a bunch of BF3 screenshots with different settings.
It's near impossible to get shots in the exact same spot for BF3 because when you change video settings they don't apply until you quit and restart the game. I had to use an empty server, and every time you rejoin the server it positions you in a different spot, and you can't move from that area.
Just look at memory usages though and you will get the idea. Really what I am seeing here is that AA uses more memory inf BF3 compared to other games. That overall BF3 just uses a lot of memory to begin with. Also, this puts to bed the idea that games use all the VRAM you have if they need it or not. Just not the case, every game makes different usage of VRAM, but none use as much as BF3 does. The only one that comes close is Crysis and my Crysis is heavily modded with upgraded textures.
Here is Crysis on settings above Very High using mods and texture packs.
This first shot is with 4xAA - 1.4GB usage
Without AA - 1.287GB Usage
Starcraft all on Ultra with 4xAA and 2xTRSAA - 1.185GB Usage
Witcher 2 All Maximum settings
With Ubersampling On - .934GB Usage
Ubersampling Off - .859GB Usage
BFBC2 Everything on Maximum setttings - These are interesting because this is the first iteration of FB and it also shows big memory usage from turning on AA, but not huge memory usage to begin with regardless of AA like I see in BF3.
With 8xMSAA - 1.084GB Usage
With no AA - .758GB Usage
Finally here is BF3 with some different settings
This is on all Ultra, HBAO, no post AA, 4x MSAA - 1.502GB Usage
This is on all Ultra, HBAO, no post AA, 2x MSAA - 1.414GB Usage
This is on all Ultra, HBAO, no post AA, No AA - 1.319GB Usage
Can only add 10 images per post, the links to the final two images.
This is on all Medium, HBAO, no post AA, 4x AA - 1.42GB Usage
http://i.imgur.com/9dipG.jpg
This is on all Medium, HBAO, no post AA, No AA - 1.245GB Usage
http://i.imgur.com/1COFE.jpg
BF3 is pretty monstrous on wanting VRAM. The only other game I've played that is near it is the first Crysis and that is with it heavily modded from the stock game.
No other game I play makes use of all the VRAM available just because it is there.
BF3 is making use of this VRAM, why so much ? When I run the ultra settings with 4xAA it hitches, backing off from the AA corrects it. First game I have played that causes hitching with 4xAA at my resolution.
I'm going with VRAM hungry.