Minimum:
* Windows Vista or 7
* Core i5 or Phenom X4 CPU
* 2 GB RAM
* 896 MB VRAM
* GeForce GTX 260 or Radeon HD 5770 GPU
* 15 GB HD space
About ArmA III
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source: forums.bistudio.com/showthread.php?119512-Arma-3-Confirmed-features-info-amp-discussion