Official specs from Steam

The Long Dark system requirements

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

Minimum

NoteRequires a 64-bit processor and operating system
OS *Windows 8
ProcessorDual-Core Intel i5 CPU @ 2GHz+
Memory4 GB RAM
GraphicsIntel 4xxx Series w/ 512MB VRAM or better
Storage7 GB available space
Sound CardAny on-board chip will work.

Recommended

NoteRequires a 64-bit processor and operating system
OSWindows 10
ProcessorIntel i7 CPU @ 2.6GHz or higher
Memory8 GB RAM
GraphicsnVidia GTX 555 w/ 1GB VRAM or better
Storage7 GB available space
Sound CardIdeally, something with Surround capabilities.

macOS minimum

OSOSX 10.9.3
ProcessorCore i5 @ 2.2GHz
Memory4 GB RAM
GraphicsIntel HD Graphics 5000
Storage7 GB available space
Sound CardOn-board.

macOS recommended

OSOSX 10.9.3
ProcessorCore i7 @ 2.7GHz+
Memory8 GB RAM
GraphicsDedicated standalone GPU w/ 1GB+ VRAM
Storage7 GB available space
Sound CardOn-board

FAQ

What graphics card do I need for The Long Dark?

Minimum: Intel 4xxx Series w/ 512MB VRAM or better. Recommended: nVidia GTX 555 w/ 1GB VRAM or better.

How much RAM does The Long Dark need?

The Long Dark needs 4 GB RAM at minimum, 8 GB RAM recommended.

How big is The Long Dark?

The Long Dark requires 7 GB available space.

Does The Long Dark run on Mac or Steam Deck/Linux?

Yes, there is a native macOS version. A native Linux build is available.