Official specs from Steam

Diablo IV system requirements

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

Minimum

NoteRequires a 64-bit processor and operating system
OS64-bit Windows® 10 version 1909 or newer
ProcessorIntel® Core™ i5-2500K or AMD™ FX-8350
Memory8 GB RAM
GraphicsNVIDIA® GeForce® GTX 660 or Intel® Arc™ A380 or AMD Radeon™ R9 280
DirectXVersion 12
NetworkBroadband Internet connection
Storage90 GB available space
Additional Notes*1080p native resolution / 720p render resolution, low graphics settings, 30fps, SSD Required

Recommended

NoteRequires a 64-bit processor and operating system
OS64-bit Windows® 10 version 1909 or newer
ProcessorIntel® Core™ i5-4670K or AMD Ryzen™ 1300X
Memory16 GB RAM
GraphicsNVIDIA® GeForce® GTX 970 or Intel® Arc™ A750 or AMD Radeon™ RX 470
DirectXVersion 12
NetworkBroadband Internet connection
Storage90 GB available space
Additional Notes*1080p resolution, medium graphics settings, 60fps, SSD Required

FAQ

What graphics card do I need for Diablo IV?

Minimum: NVIDIA® GeForce® GTX 660 or Intel® Arc™ A380 or AMD Radeon™ R9 280. Recommended: NVIDIA® GeForce® GTX 970 or Intel® Arc™ A750 or AMD Radeon™ RX 470.

How much RAM does Diablo IV need?

Diablo IV needs 8 GB RAM at minimum, 16 GB RAM recommended.

How big is Diablo IV?

Diablo IV requires 90 GB available space.

Does Diablo IV run on Mac or Steam Deck/Linux?

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