Official specs from Steam

Dark Souls II system requirements

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

Minimum

OS *Windows Vista SP2, Windows 7 SP1, Windows 8
ProcessorAMD® Phenom II™ X2 555 3.2Ghz or Intel® Pentium Core ™ 2 Duo E8500 3.17Ghz
Memory2 GB RAM
GraphicsNVIDIA® GeForce® 9600GT, ATI Radeon™ HD 5870
DirectXVersion 9.0c
NetworkBroadband Internet connection
Storage12 GB available space
Sound CardDirectX 9 sound device
Additional NotesController support: Microsoft Xbox 360® Controller for Windows® (or equivalent) recommended

Recommended

OS *Windows 7 SP1, Windows 8
ProcessorIntel® CoreTM i3 2100 3.10GHz or AMD® A8 3870K 3.0GHz
Memory4 GB RAM
GraphicsNVIDIA® GeForce® GTX 750 or ATI Radeon™ HD 6870 or higher
DirectXVersion 9.0c
NetworkBroadband Internet connection
Storage15 GB available space
Sound CardDirectX 9 sound device
Additional NotesController support: Microsoft Xbox 360® Controller for Windows® (or equivalent) recommended

FAQ

What graphics card do I need for Dark Souls II?

Minimum: NVIDIA® GeForce® 9600GT, ATI Radeon™ HD 5870. Recommended: NVIDIA® GeForce® GTX 750 or ATI Radeon™ HD 6870 or higher.

How much RAM does Dark Souls II need?

Dark Souls II needs 2 GB RAM at minimum, 4 GB RAM recommended.

How big is Dark Souls II?

Dark Souls II requires 12 GB available space.

Does Dark Souls II run on Mac or Steam Deck/Linux?

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