Steam Update
There's another Steam update, offering updates for the Source Engine as well as Counter-Strike: Source and Half-Life: Source. The Counter-Strike: Source update adds validation for custom player model and weapon materials.
From The Chatty
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I can't run Half-Life source with 5.1 speaker setup because of the choppiness.
Radeon 9600 Pro
Realtek audio
Athlon XP at 1.7 ghz
I was amazed at not being able to run this game at 4 million fps. Maybe they could work on that? :/