Locked to 60 FPS sounds like the 60Hz refresh rate bug with Win2k and XP. Microsoft addressed this issue with Direct3D apps, but of course left OpenGL for the birds. Since HL utilizes OpenGL, I'm inclined to believe this is further evidence of the 60Hz bug. It's not that your card isn't capable of the framerate you're looking for with HL, it's just this bug. Now, to fix this bug, you need to use some kind of refresh rate locking utility such as "Reforce" or "Radeonator Locker" (latter is my favorite, but discontinued/hard to find, works with Nvidia cards despite its name). The quick fix is to disable Verticle Syncronization (VSYNC), but this will cause massive tearing as the card will be pumping out >60 FPS easily. HTH