Within the past 72 hours, Nvidia has released Geforce 185.63 beta and Geforce 185.65 beta drivers for its Geforce 8-series (G92), 9-series, and 200-series GPUs. Apparently, these releases didn’t meet up to the company’s expectations so it pulled them and came back today with an update, Geforce 185.66 beta.

These drivers are identical in feature set to .65, including support for Ambient Occlusion, the newly released Geforce GTX 275, and CUDA 2.2 for improved performance in GPU Computing applications.

As we mentioned yesterday, this release reinstates the Ambient Occlusion feature, although to a more limited extent. In 185.20 beta, the setting could be set to Low, Medium, High and Off. In the more refined .63 and .65, only On and Off can be selected. On another note, Nvidia claims the following examples of improvement over official Geforce 182-family drivers:

Up to 11% performance increase in Call of Duty: World at War. Up to 5% performance increase Company of Heroes: Opposing Fronts. Up to 22% performance increase Crysis: Warhead with antialiasing enabled. Up to 11% performance increase in Fallout 3 with antialiasing enabled. Up to 14% performance increase in Far Cry 2. Up to 45% performance increase in Mirror's Edge with antialiasing enabled.

Again, the drivers are bundled with the PhysX 9.09.0203 WHQL system software and include support for GeForce Plus Power Pack #3.

Geforce 185.66 beta Vista 64-bit

Geforce 185.66 beta Vista 32-bit

Geforce 185.66 beta XP 64-bit

Geforce 185.66 beta XP 32-bit