PC requirements

Thief II: The Metal Age System Requirements

Thief II: The Metal Age needs at least 1.8 GHz Processor, 512MB RAM (1 GB recommended) and 3D graphics card compatible with DirectX 7 (compatible with DirectX 9 recommended) graphics.

Verified Sources: Steam store listing
Thief II: The Metal Age minimum and recommended PC specifications
Component Minimum
Operating system Windows XP or Windows Vista
Processor 1.8 GHz Processor
Memory 512MB RAM (1 GB recommended)
Graphics 3D graphics card compatible with DirectX 7 (compatible with DirectX 9 recommended)
Storage 2GB HDD
Not sure how your PC compares? Use the Can I Run It checker — pick your CPU and GPU and it tells you which column you land in.

Other platforms

Thief II: The Metal Age is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running Thief II: The Metal Age on PC

Can my PC run Thief II: The Metal Age?
Compare your CPU, GPU and RAM against the minimum column below. If your parts match or beat every minimum row, the game will launch — though you may need to lower settings. Matching the recommended column is what gets you 60fps at 1080p.
How much storage does Thief II: The Metal Age need?
2GB HDD