[Michael Barnes]

Think I found it...
The minimum system spec is currently targeted at a 700 MHz PC with 128 MB RAM and a DX6-level video card, eg: TNT2 etc, meaning you won't need a supercomputer to run Half-Life 2 but don't expect to see reflective water,dynamic shadows and bump-mapped textures.

The game running at reasonable detail eg: 25/40 fps, requires a 1600Mhz cpu, 256 mb ram, GeForce4 Ti or Ati Radeon card.


In real life you need the best from a new game so I would recommend a 2000 cpu, or higher 512 mb ram or higher, GeForce4 Ti4800 128 ddr or ATI Radeon 9600 pro.
IF you've got the money ATI Radeon 9800 pro. or Geforce FX5900 ultra
The more power the better but not essential with this game.

[Terpfen]

No, those aren't the minimum specs. These are straight from Valve:

Minimum Requirements

* 1.2 GHz Processor
* 256MB RAM
* DirectX 7 level graphics card
* Windows 2000/XP/ME/98

Recommended System

* 2.4 GHz Processor
* 512MB RAM
* DirectX 9 level graphics card
* Windows 2000/XP

I personally am on a P4 2.8Ghz with 1GB RAM and a Radeon 9800 Pro 128MB version, and with the Catalyst 4.12 beta drivers, I get about 61FPS in the Counter-Strike Source video stress test. Used to get 56.

UPDATE YOUR DRIVERS, EVERYONE!