PC requirements

XCOM: Enemy Within System Requirements

XCOM: Enemy Within needs at least 2 GHz Dual Core (Core 2 Duo 2.4 GHz or Athlon X2 2.7 GHz) CPU, 2 GB RAM and 256 MB Video Memory NVIDIA GeForce 8600 GT / ATI Radeon HD 2600 XT or greater graphics. For the recommended experience you want 2.4 GHz Quad Core CPU, 4 GB RAM and 512MB Video Memory ATI Radeon HD 3000 Series/NVIDIA GeForce 9000 Series or greater graphics.

Verified Sources: Steam store listing
XCOM: Enemy Within minimum and recommended PC specifications
Component Minimum Recommended
Operating system Windows Vista or later Windows 7
Processor 2 GHz Dual Core (Core 2 Duo 2.4 GHz or Athlon X2 2.7 GHz) CPU 2.4 GHz Quad Core CPU
Memory 2 GB RAM 4 GB RAM
Graphics 256 MB Video Memory NVIDIA GeForce 8600 GT / ATI Radeon HD 2600 XT or greater 512MB Video Memory ATI Radeon HD 3000 Series/NVIDIA GeForce 9000 Series or greater
Storage 20 GB available space 20 GB available space
Additional notes DirectX compatible sound card DirectX compatible sound card
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

XCOM: Enemy Within is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running XCOM: Enemy Within on PC

Can my PC run XCOM: Enemy Within?
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 XCOM: Enemy Within 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.