Below are the current minimum and recommended system requirements for Diablo IV on Windows®. Due to potential programming changes, these requirements may change over time.

Minimum Requirements

• OS: 64-bit Windows® 10 version 1909 or newer
• Processor: Intel® Core i5-2500K or AMD™ FX-8350
• Memory: 8 GB RAM
• Graphics: NVIDIA® GeForce® GTX 660 or AMD Radeon™ R9 280
• DirectX®: Version 12
• Storage: SSD with 90 GB available space
• Internet: Broadband Connection

* 1080p native resolution / 720p render resolution, low graphics settings, 30fps

** Diablo IV will attempt to run on hardware below minimum specifications, including HDDs, dual-core CPUs, and Integrated GPUs. However, the game experience may be significantly diminished.

Medium (Recommended Requirements)

• OS: 64-bit Windows® 10 version 1909 or newer
• Processor: Intel® Core i5-4670K or AMD™ R3-1300X
• Memory: 16 GB RAM
• Graphics: NVIDIA® GeForce® GTX 970 or AMD Radeon™ RX 470
• DirectX®: Version 12
• Storage: SSD with 90 GB available space
• Internet: Broadband Connection

* 1080p resolution, medium graphics settings, 60fps

High

• OS: 64-bit Windows® 10 version 1909 or newer
• Processor: Intel® Core i7-8700K or AMD Ryzen™ 2700X
• Memory: 16 GB RAM
• Graphics: NVIDIA GeForce® RTX 2060 or AMD Radeon™ RX 5700 XT
• DirectX®: Version 12
• Storage: SSD with 90 GB available space
• Internet: Broadband Connection

* 1080p resolution, high graphics settings, 60fps

Ultra 4k

• OS: 64-bit Windows® 10 version 1909 or newer
• Processor: Intel® Core i7-8700K or AMD Ryzen™ 7 2700X
• Memory: 32 GB RAM
• Graphics: NVIDIA GeForce® RTX 3080; NVIDIA GeForce® RTX 40 Series for fully supported DLSS3 or AMD Radeon™ RX 6800 XT
• DirectX®: Version 12
• Storage: SSD with 90 GB available space
• Internet: Broadband Connection

* 4k resolution, ultra graphics settings, 60fps

Source : https://us.battle.net/support/en/article/251518