Official specs from Steam

Arma 3 system requirements

Minimum and recommended PC specs as listed by the developer on Steam. Native macOS version available.

Minimum

OSWindows 10 (64-bit)
ProcessorIntel Core quad-core or AMD Athlon quad-core
Memory8 GB RAM
GraphicsNVIDIA GeForce GTX 660 or AMD Radeon HD 7850 or Intel HD Graphics 4000, with 1 GB video memory
DirectX®10
Storage50 GB available space
AudioDirectX® compatible
OtherInternet connection and free Steam account to activate Dual Layer compatible when installing from DVD

Recommended

OSWindows 10 / 11 (64-bit)
ProcessorIntel Core i7-7700K or AMD Ryzen 3 3300X or better
Memory16 GB RAM
GraphicsNVIDIA GeForce GTX 1060 or AMD Radeon RX 580, with 6 GB VRAM, or better
DirectX®11
Storage80 GB available space (SSD)
SoundDirectX® compatible
OtherInternet connection and free Steam account to activate Dual Layer compatible when installing from DVD

macOS minimum

OSmacOS Big Sur 11
ProcessorApple M1 or 2-core Intel Core i5 1.4 GHz or better
Memory8 GB RAM
GraphicsIntel HD Graphics 5000 or better
GPU Memory1 GB
Hard Drive45 GB

macOS recommended

OSmacOS Big Sur 11
ProcessorApple M2 or 6-core Intel Core i5 3.7 GHz or better
Memory16 GB RAM
GraphicsAMD Radeon Pro 580X or better
GPU Memory2 GB
Hard Drive130 GB

FAQ

What graphics card do I need for Arma 3?

Minimum: NVIDIA GeForce GTX 660 or AMD Radeon HD 7850 or Intel HD Graphics 4000, with 1 GB video memory. Recommended: NVIDIA GeForce GTX 1060 or AMD Radeon RX 580, with 6 GB VRAM, or better.

How much RAM does Arma 3 need?

Arma 3 needs 8 GB RAM at minimum, 16 GB RAM recommended.

How big is Arma 3?

Arma 3 requires 50 GB available space.

Does Arma 3 run on Mac or Steam Deck/Linux?

Yes, there is a native macOS version. There is no native Linux build (Proton compatibility may vary).