Official specs from Steam

Half-Life: Alyx system requirements

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

Half-Life: Alyx release infoSteam page Check other games

Minimum

NoteRequires a 64-bit processor and operating system
OSWindows 10
ProcessorCore i5-7500 / Ryzen 5 1600
Memory12 GB RAM
GraphicsGTX 1060 / RX 580 - 6GB VRAM
VR SupportSteamVR

Recommended

NoteRequires a 64-bit processor and operating system

FAQ

What graphics card do I need for Half-Life: Alyx?

Minimum: GTX 1060 / RX 580 - 6GB VRAM.

How much RAM does Half-Life: Alyx need?

Half-Life: Alyx needs 12 GB RAM at minimum.

Does Half-Life: Alyx run on Mac or Steam Deck/Linux?

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