Looks like Nvidia's new GeForce GTX 660 and 650 graphics cards have arrived hand-in-hand with a fresh driver release. The GeForce 306.23 drivers are downloadable now from Nvidia's GeForce.com website, but they add more than just support for the newcomers. In the accompanying blog post, Nvidia calls the drivers an "essential upgrade for every GeForce GTX user." And it's no wonder why:
[T]he GeForce 306.23 WHQL drivers enable high-quality TXAA anti-aliasing on GTX 600 Series GPUs, improve game performance by up to 17% on all GeForce 400, 500, and 600 Series GPUs, enhance seven top titles with NVIDIA Control Panel MSAA and Ambient Occlusion profiles, improve the overall user experience for all GPU users, and add SLI and 3D Vision profiles for new releases and upcoming titles, including Borderlands 2, Darksiders 2, Dishonored, End of Nations, F1 2012, Guild Wars 2, Max Payne 3, Orcs Must Die! 2, PlanetSide 2, Sleeping Dogs, The Secret World, The Walking Dead, Torchlight II, and World of Warcraft: Mists of Pandaria.
TXAA already made an appearance in Nvidia's GeForce 304.79 beta drivers back in July, so it's not entirely new, strictly speaking. Still, the 306.23 release is the first non-beta driver (one with Windows Hardware Quality Labs certification) to include the feature. Be sure to check out Scott's writeup on TXAA for more details.
Oh, and according to Nvidia, the GeForce 306.23 drivers also deliver "maximum compatiblity" with Borderlands 2 and World of Warcraft: Mists of Pandaria. You'll find a more complete list of additions, bug fixes, and outstanding issues in the official release notes.