PC requirements

Thief System Requirements

Thief needs at least High-Performance Dual Core CPU or Quad Core CPU, 4 GB RAM and AMD Radeon 4800 series / Nvidia GTS 250 graphics. For the recommended experience you want AMD FX 8000 series or better / Intel Quad i7 Core CPU, 4 GB RAM and AMD Radeon HD R9 series or better / Nvdia GTX 660 series or better graphics.

Verified Sources: Steam store listing
Thief minimum and recommended PC specifications
Component Minimum Recommended
Operating system Windows Vista with Platform Update for Windows Vista Windows 7, Windows 8
Processor High-Performance Dual Core CPU or Quad Core CPU AMD FX 8000 series or better / Intel Quad i7 Core CPU
Memory 4 GB RAM 4 GB RAM
Graphics AMD Radeon 4800 series / Nvidia GTS 250 AMD Radeon HD R9 series or better / Nvdia GTX 660 series or better
DirectX Version 10 Version 11
Storage 20 GB available space 20 GB available space
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 is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running Thief on PC

Can my PC run Thief?
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 need?
20 GB available space
What is the difference between minimum and recommended specs?
Minimum means the game starts and is playable, usually at 30fps on low settings at 1080p. Recommended is the developer's target for a smooth 60fps experience at high settings.