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According to Ubisoft Battlefield 4 is said to have similar requirements to that of Battlefield 3, this information comes as just recently Ubisoft accidentally published what looks to be like potential official requirements for the game on it’s Uplay game store.
What’s definitely eye catching is if you look at the minimum operating system for this new set of requirements from Ubisoft, you can see that it states the game only requires a 32-bit Windows Vista running on Service Pack 1, while the Alpha trial for the game required a 64-bit Windows Vista running on Service Pack 2 to run.
THE  SYSTEM REQUIREMENTS OF BATTLE FIELD 4 ARE:

An update by Origin Producer Redditor Offspring said:

”I don’t believe the final system requirements have been decided yet, and this looks a lot like placeholder system requirements from BF3 with a couple of tweaks. I know everyone’s excited for BF4 news, but I wouldn’t trust an Ubisoft page with system requirements for it just yet.”
Below you can check out the requirements posted by Ubisoft as well as the game trial and Battlefield 3 to compare.


Ubisoft’s Battlefield 4 system requirements:


Minimum
OS: Windows Vista (Service Pack 1) 32-bit
Processor: Processor: 2 GHz Dual Core (Core2 Duo 2.4 GHz
or Althon X2 2.7 GHz)
Memory: 2 GB System RAM
Hard Drive: 20 GB
Video Card:DirectX 10.1 compatible with 512 MB RAM
Sound Card: DirectX 9.0c compatible
RecommendedOS: Windows 7 64-bit
Processor: Quad-core CPU
Memory: 4 GB
Hard Drive: 20 GB
Video Card: DirectX 11 compatible with 1024 MB RAM (NVIDIA
GeForce GTX 560 or ATI Radeon 6950)
Sound Card: DirectX 9.0c compatible


Battlefield 4 Alpha trial system requirements:

OS: Vista SP2, Win7 (Win8 not supported)
64 bit (32 bit not supported)
Dx10 or Dx 11 GPU with 1+GB of RAM, Dx 11 highly recommended
25GB HDD free space required
Latest Origin version required


Battlefield 3 system requirements:

Minimum
OS: Windows Vista or Windows 7
Processor: Core 2 Duo 2.4 GHz or Althon X2 2.7 GHz
RAM: 2GB
Graphic card: DirectX 10 or 11 compatible Nvidia or AMD ATI card,
ATI Radeon 3870 or higher, Nvidia GeForce 8800 GT or higher.
Graphics card memory: 512 MB
Sound card: DirectX compatible sound card
Hard drive: 15 GB for disc version or 10 GB for digital version
Recommended
OS: Windows 7 64-bit
Processor: Quad-core Intel or AMD CPU
RAM: 4GB
Graphics card: DirectX 11 Nvidia or AMD ATI card, Nvidia GeForce
GTX 560 or ATI Radeon 6950.
Graphics card memory: 1 GB
Sound card: DirectX compatible sound card
Hard drive: 15 GB for disc version or 10 GB for digital version