Official specs from Steam

S.T.A.L.K.E.R.: Shadow of Chernobyl system requirements

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

Minimum

Supported OSMicrosoft® Windows® XP(Service Pack 2)/Microsoft® Windows® 2000 SP4
ProcessorIntel Pentium 4 2.0 Ghz / AMD XP 2200+
Graphics128 MB DirectX® 8.0 compatible card / nVIDIA® GeForce™ 5700 / ATI Radeon® 9600
Memory512 MB RAM
SoundDirectX® 9.0 compatible sound card
Hard Drive6 GB free hard disc space

Recommended

Supported OSMicrosoft® Windows® XP/Vista (SP1)
ProcessorIntel Core 2 Duo E6400 / AMD 64 X2 4200+
Graphics256 MB DirectX® 9.0c compatible card* / nVIDIA® GeForce™ 8800 GT / ATI Radeon® HD 2900 XT
Memory2 GB RAM
SoundDirectX® 9.0 compatible sound card
Hard Drive10 GB free hard disc space

FAQ

What graphics card do I need for S.T.A.L.K.E.R.: Shadow of Chernobyl?

Minimum: 128 MB DirectX® 8.0 compatible card / nVIDIA® GeForce™ 5700 / ATI Radeon® 9600. Recommended: 256 MB DirectX® 9.0c compatible card* / nVIDIA® GeForce™ 8800 GT / ATI Radeon® HD 2900 XT.

How much RAM does S.T.A.L.K.E.R.: Shadow of Chernobyl need?

S.T.A.L.K.E.R.: Shadow of Chernobyl needs 512 MB RAM at minimum, 2 GB RAM recommended.

How big is S.T.A.L.K.E.R.: Shadow of Chernobyl?

S.T.A.L.K.E.R.: Shadow of Chernobyl requires 6 GB free hard disc space.

Does S.T.A.L.K.E.R.: Shadow of Chernobyl run on Mac or Steam Deck/Linux?

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