This driver has a bug on the GlFinish instruction (It's disabled by default), that doesn't sync properly the CPU with the GPU (It's disabled by default on the driver).
Without it, the Source Engine works in an horrible way, and I'm forced to switch to MESA drivers (X.Org Radeon Drivers).
How I can enable it on the driver? There's a way? Or I'm forced to wait for a future update?