Official specs from Steam

Divinity: Original Sin system requirements

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

Minimum

OS *Windows XP SP3 or higher
ProcessorIntel Core2 Duo E6600 or equivalent
Memory2048 MB RAM
GraphicsHD Intel Graphics 4000 or NVIDIA® GeForce® 8800 GT (512 MB) or ATI™ Radeon™ HD 4850 or equivalent
DirectXVersion 9.0c
Storage10 GB available space
Sound CardDirectX9c compliant

Recommended

OS *Windows 7 SP1 or Windows 8.1
ProcessorIntel i5 2400 or higher
Memory4096 MB RAM
GraphicsNVIDIA® GeForce® GTX 550 ti 1GB ram or or ATI™ Radeon™ HD 6XXX or higher
DirectXVersion 9.0c
Storage10 GB available space
Sound CardDirectX9c compliant

macOS minimum

OSOS X 10.8.5
ProcessorIntel Core 2 Duo
Memory4 GB RAM
GraphicsIntel HD Graphics 3000/4000
Storage10 GB available space
Additional NotesHD3000 & HD4000 benefit from 8Gb of memory

macOS recommended

OSOS X 10.9.3
ProcessorIntel i5 or higher
Memory4 GB RAM
GraphicsIntel Iris (Iris Pro) or ATI™ Radeon™ HD 6XXX or higher or NVidia 6xx series or higher
Storage10 GB available space
Additional NotesHFS+ filesystem with case-sensitivity is not yet supported

FAQ

What graphics card do I need for Divinity: Original Sin?

Minimum: HD Intel Graphics 4000 or NVIDIA® GeForce® 8800 GT (512 MB) or ATI™ Radeon™ HD 4850 or equivalent. Recommended: NVIDIA® GeForce® GTX 550 ti 1GB ram or or ATI™ Radeon™ HD 6XXX or higher.

How much RAM does Divinity: Original Sin need?

Divinity: Original Sin needs 2048 MB RAM at minimum, 4096 MB RAM recommended.

How big is Divinity: Original Sin?

Divinity: Original Sin requires 10 GB available space.

Does Divinity: Original Sin run on Mac or Steam Deck/Linux?

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