Halo requires a personal computer with the following minimum requirements.

•Multimedia personal computer with a 733 MHz or higher processor.
•Windows 98 Second Edition, Windows Me, Windows 2000 Service Pack 1, or Windows XP.
•128 Megabytes (MB) of RAM.
•1.3 GB of available hard disk space.
•8× CD-ROM drive.
•32 MB 3D hardware-transform-and-lighting-capable video display.
•Keyboard and Microsoft Mouse or compatible pointing device.
•Sound card and speakers or headphones.
•DirectX 9.0b (included on CD; see below for installation instructions).
•56 Kbps modem or LAN for online network play. Broadband required to run a server.

PC Minimum System Requirements:
1.7 GHz Processor,
512MB RAM,
DirectX® 8.1 level Graphics Card (Requires support for SSE),
Windows® Vista/XP/2000, Mouse, Keyboard, Internet Connection

PC Recommended System Requirements:
Pentium 4 processor (3.0GHz, or better),
1GB RAM,
DirectX® 9 level Graphics Card,
Windows® Vista/XP/2000, Mouse, Keyboard, Internet Connection

Mac Minimum System Requirements
OS X version Leopard 10.5.8,Snow Leopard 10.6.3,
1GB RAM,
NVIDIA GeForce 8 or higher, or ATI X1600 or higher,
Mouse, Keyboard, Internet Connection

PC Minimum System Requirements:
1.7 GHz Processor,
512MB RAM,
DirectX® 8.1 level Graphics Card (Requires support for SSE),
Windows® Vista/XP/2000, Mouse, Keyboard, Internet Connection

PC Recommended System Requirements:
Pentium 4 processor (3.0GHz, or better),
1GB RAM,
DirectX® 9 level Graphics Card,
Windows® Vista/XP/2000, Mouse, Keyboard, Internet Connection

Mac Minimum System Requirements
OS X version Leopard 10.5.8,Snow Leopard 10.6.3,
1GB RAM,
NVIDIA GeForce 8 or higher, or ATI X1600 or higher,
Mouse, Keyboard, Internet Connection

PC Minimum System Requirements:
1.7 GHz Processor,
512MB RAM,
DirectX® 8.1 level Graphics Card (Requires support for SSE),
Windows® Vista/XP/2000, Mouse, Keyboard, Internet Connection

PC Recommended System Requirements:
Pentium 4 processor (3.0GHz, or better),
1GB RAM,
DirectX® 9 level Graphics Card,
Windows® Vista/XP/2000, Mouse, Keyboard, Internet Connection

Mac Minimum System Requirements
OS X version Leopard 10.5.8,Snow Leopard 10.6.3,
1GB RAM,
NVIDIA GeForce 8 or higher, or ATI X1600 or higher,
Mouse, Keyboard, Internet Connection

PC Minimum System Requirements:
Pentium 4 2.4GHz or AMD 2800+ Processor,
1GB RAM, DirectX 9 level graphics card,
Windows 2000/XP,
Mouse, Keyboard, Internet Connection

PC Minimum System Requirements:
1.2 GHz Processor,
256MB RAM, DirectX 7 level graphics card,
Windows 2000/XP,
Mouse, Keyboard, Internet Connection

PC Recommended System Requirements:
2.4 GHz Processor,
512MB RAM,
DirectX 9 level graphics card,
Windows 2000/XP,
Mouse, Keyboard, Internet Connection

PC Minimum System Requirements:
1.2 GHz Processor,
256MB RAM, DirectX 7 level graphics card,
Windows 2000/XP,
Mouse, Keyboard, Internet Connection

PC Recommended System Requirements:
2.4 GHz Processor,
512MB RAM,
DirectX 9 level graphics card,
Windows 2000/XP,
Mouse, Keyboard, Internet Connection