Official specs from Steam

Assassin's Creed Unity system requirements

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

Minimum

OSWindows 10 (64-bit versions only)
ProcessorIntel Core i5-2500K @ 3.3 GHz or AMD FX-8350 @ 4.0 GHz
Memory6 GB RAM
GraphicsNVIDIA GeForce GTX 680 or AMD Radeon HD 7970 (2 GB VRAM)
Storage50 GB available space
Sound CardDirectX 9.0c compatible sound card with latest drivers
Additional NotesWindows-compatible keyboard and mouse required, optional controller

Recommended

OSWindows 10 (64-bit versions only)
ProcessorIntel Core i7-3770 @ 3.4 GHz or AMD FX-8350 @ 4.0 GHz or better
Memory8 GB RAM
GraphicsNVIDIA GeForce GTX 780 or AMD Radeon R9 290X (3 GB VRAM)
Storage50 GB available space
Sound CardDirectX 9.0c compatible sound card with latest drivers
Additional NotesSupported video cards at the time of release: NVIDIA GeForce GTX 680 or better, GeForce GTX 700 series; AMD Radeon HD7970 or better, Radeon R9 200 series Note: Laptop versions of these cards may work but are NOT officially supported.

FAQ

What graphics card do I need for Assassin's Creed Unity?

Minimum: NVIDIA GeForce GTX 680 or AMD Radeon HD 7970 (2 GB VRAM). Recommended: NVIDIA GeForce GTX 780 or AMD Radeon R9 290X (3 GB VRAM).

How much RAM does Assassin's Creed Unity need?

Assassin's Creed Unity needs 6 GB RAM at minimum, 8 GB RAM recommended.

How big is Assassin's Creed Unity?

Assassin's Creed Unity requires 50 GB available space.

Does Assassin's Creed Unity run on Mac or Steam Deck/Linux?

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