Official specs from Steam

Don't Starve Together system requirements

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

Minimum

OS *Windows Vista/Windows 7/Windows 8
Processor1.7+ GHz or better
Memory1 GB RAM
GraphicsRadeon HD5450 or better; 256 MB or higher
DirectXVersion 9.0c
NetworkBroadband Internet connection
Storage3 GB available space
Sound Card100% DirectX9.0c compatible sound card and drivers

macOS minimum

OSLion (OSX 10.7.X)
Processor2.0 GHz Intel
Memory4 GB RAM
GraphicsNVidia or ATI graphics card
NetworkBroadband Internet connection
Storage3 GB available space
Additional NotesNot recommended for Intel GMA Graphics or Mac Minis or early-generation MacBooks

FAQ

What graphics card do I need for Don't Starve Together?

Minimum: Radeon HD5450 or better; 256 MB or higher.

How much RAM does Don't Starve Together need?

Don't Starve Together needs 1 GB RAM at minimum.

How big is Don't Starve Together?

Don't Starve Together requires 3 GB available space.

Does Don't Starve Together run on Mac or Steam Deck/Linux?

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