Official specs from Steam

Black Mesa system requirements

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

Black Mesa release infoSteam page Check other games

Minimum

OSWindows® 10 or Newer
Processor2.6 Dual Core Processor or Greater
Memory6 GB RAM
Graphics2 GB Dedicated Video Card or Greater
DirectXVersion 9.0c
NetworkBroadband Internet connection
Storage20 GB available space

Recommended

OSWindows® 10 or Newer
Processor3.2 Quad Core Processor or Greater
Memory8 GB RAM
Graphics4 GB Dedicated Video Card or Greater
DirectXVersion 9.0c
NetworkBroadband Internet connection
Storage20 GB available space

FAQ

What graphics card do I need for Black Mesa?

Minimum: 2 GB Dedicated Video Card or Greater. Recommended: 4 GB Dedicated Video Card or Greater.

How much RAM does Black Mesa need?

Black Mesa needs 6 GB RAM at minimum, 8 GB RAM recommended.

How big is Black Mesa?

Black Mesa requires 20 GB available space.

Does Black Mesa run on Mac or Steam Deck/Linux?

There is no native macOS version. A native Linux build is available.