Official specs from Steam

Metal Gear Solid V: Ground Zeroes system requirements

Minimum and recommended PC specs as listed by the developer on Steam.

Minimum

OS *Windows Vista SP2 x64, Windows 7 x64, Windows 8 x64 (64-bit OS Required)
ProcessorCore i5-4460 (3.20GHz) or better *Quad-Core or better
Memory4 GB RAM
GraphicsNVIDIA GeForce GTX 650 (2GB) or better (DirectX 11 graphics card required)
DirectXVersion 11
Storage4 GB available space
Sound CardDirectX 9.0c compatible sound card

Recommended

OS *Windows 7 x64, Windows 8 x64 (64-bit OS Required)
ProcessorCore i7-4790 (3.60GHz) or better *Quad-Core or better
Memory4 GB RAM
GraphicsNVIDIA GeForce GTX 760 (DirectX 11 graphics card required)
DirectXVersion 11
Storage4 GB available space
Sound CardDirectX 9.0c compatible sound card (Surround Sound 5.1)

FAQ

What graphics card do I need for Metal Gear Solid V: Ground Zeroes?

Minimum: NVIDIA GeForce GTX 650 (2GB) or better (DirectX 11 graphics card required). Recommended: NVIDIA GeForce GTX 760 (DirectX 11 graphics card required).

How much RAM does Metal Gear Solid V: Ground Zeroes need?

Metal Gear Solid V: Ground Zeroes needs 4 GB RAM at minimum, 4 GB RAM recommended.

How big is Metal Gear Solid V: Ground Zeroes?

Metal Gear Solid V: Ground Zeroes requires 4 GB available space.

Does Metal Gear Solid V: Ground Zeroes run on Mac or Steam Deck/Linux?

There is no native macOS version. There is no native Linux build (Proton compatibility may vary).