PC requirements

Call of Duty 4: Modern Warfare System Requirements

Call of Duty 4: Modern Warfare needs at least Intel® Pentium® 4 2.4 Ghz / AMD(R) 64 (TM) 2800+ / Intel® and AMD® 1.8 Ghz Dual Core Processor or better supported, 512MB RAM (Windows® XP), 768MB RAM (Vista®) and NVIDIA Geforce 6600 or better or ATI Radeon® 9800Pro or better graphics.

Verified Sources: Steam store listing
Call of Duty 4: Modern Warfare minimum and recommended PC specifications
Component Minimum
Processor Intel® Pentium® 4 2.4 Ghz / AMD(R) 64 (TM) 2800+ / Intel® and AMD® 1.8 Ghz Dual Core Processor or better supported
Memory 512MB RAM (Windows® XP), 768MB RAM (Vista®)
Graphics NVIDIA Geforce 6600 or better or ATI Radeon® 9800Pro or better
Storage 8GB of free hard drive 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.
Playing on a handheld instead? Players report Call of Duty 4: Modern Warfare as Gold on Steam Deck and Linux.

Other platforms

Call of Duty 4: Modern Warfare is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running Call of Duty 4: Modern Warfare on PC

Can my PC run Call of Duty 4: Modern Warfare?
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 Call of Duty 4: Modern Warfare need?
8GB of free hard drive space