Official specs from Steam

Subnautica: Below Zero system requirements

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

Minimum

NoteRequires a 64-bit processor and operating system
OS *Windows 7 64-bit
ProcessorIntel Core i3 4XXX series / AMD Ryzen 3 2.6ghz+
Memory8 GB RAM
GraphicsIntel HD 530 or better
DirectXVersion 11
Storage15 GB available space

Recommended

NoteRequires a 64-bit processor and operating system
OSWindows 10 64-bit
ProcessorIntel Core i5 4XXX series/ AMD Ryzen 5 @ 3Ghz +
Memory8 GB RAM
GraphicsNvidia 1050 Ti / AMD Radeon 570, 4GB VRAM
DirectXVersion 11
Storage15 GB available space

macOS minimum

OSOS X 10.11 El Capitan
ProcessorIntel Core i5
Memory8 GB RAM
GraphicsIntel Iris Pro 650 or better
Storage15 GB available space

macOS recommended

OSOS X 10.13 High Sierra
ProcessorIntel Core i7, 4 cores
Memory8 GB RAM
GraphicsAMD Radeon R9 M395 or better
Storage15 GB available space

FAQ

What graphics card do I need for Subnautica: Below Zero?

Minimum: Intel HD 530 or better. Recommended: Nvidia 1050 Ti / AMD Radeon 570, 4GB VRAM.

How much RAM does Subnautica: Below Zero need?

Subnautica: Below Zero needs 8 GB RAM at minimum, 8 GB RAM recommended.

How big is Subnautica: Below Zero?

Subnautica: Below Zero requires 15 GB available space.

Does Subnautica: Below Zero run on Mac or Steam Deck/Linux?

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