Official specs from Steam

Kingdom Hearts III system requirements

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

Minimum

NoteRequires a 64-bit processor and operating system
OSWindows 10 64-bit (ver.1909 or later)
ProcessorIntel® Core™ i5-3330 / AMD Ryzen™3 1200
Memory8 GB RAM
GraphicsNVIDIA® GeForce® GTX 760 (VRAM 2GB) / AMD Radeon™ R7 260X (VRAM 2GB)
DirectXVersion 11
Storage75 GB available space
Additional Notes30FPS @1280×720

Recommended

NoteRequires a 64-bit processor and operating system
OSWindows 10 64-bit (ver.1909 or later)
ProcessorIntel® Core™ i5-7500 / AMD Ryzen™3 3100
Memory16 GB RAM
GraphicsNVIDIA® GeForce® GTX 1070 / AMD Radeon™ RX Vega 56
DirectXVersion 11
Storage75 GB available space
Additional Notes60FPS 1920×1080

FAQ

What graphics card do I need for Kingdom Hearts III?

Minimum: NVIDIA® GeForce® GTX 760 (VRAM 2GB) / AMD Radeon™ R7 260X (VRAM 2GB). Recommended: NVIDIA® GeForce® GTX 1070 / AMD Radeon™ RX Vega 56.

How much RAM does Kingdom Hearts III need?

Kingdom Hearts III needs 8 GB RAM at minimum, 16 GB RAM recommended.

How big is Kingdom Hearts III?

Kingdom Hearts III requires 75 GB available space.

Does Kingdom Hearts III run on Mac or Steam Deck/Linux?

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