Hello, tought i would post the BF3 requirements.
Keep in mind, these are not offical statements from Dice and/or EA games. This list is seemingly made by Gamestop. And even if it is not the final requirements for the game, it should give an idea of what to get. And they are not very detailed either.
These are both Minimum and recommended.
Minimum:
Hard Drive Space: 15 GB for disc version or 10 GB for digital version
OS: Windows Vista or Windows 7
Processor: Core 2 Duo @ 2.0GHz
RAM: 2GB
Video Card: DirectX 10 or 11 compatible Nvidia or AMD ATI card
Recommended:
Hard Drive Space: 15 GB for disc version or 10 GB for digital version
OS: Windows 7 64-bit
Processor: Quad-core Intel or AMD CPU
RAM: 4GB
Video Card: DirectX 11 Nvidia or AMD ATI card, GeForce GTX 460, Radeon Radeon HD 6850
Source: http://www.vg247.com/2011/07/08/gamestop-lists-minimum-and-recommended-specs-for-bf3-on-pc/
Secondary source: http://www.gamerzines.com/pc/news/battlefield-3-pc-specs.html
Both the sources claim that Gamestop posted the requirements. I have not found them on Gamestops sites, but i only searched for a minute.