32x AA is ridiculous. 8x~16x max. Also make sure that your AA compatibility is set to 0x00020041 and if you're using Ambient Occlusion, set compatibility to 0x00000026.
Optimal settings that I've found for a high end GPU are:
Ambient Occlusion Compatibility: 0x00000026
Antialiasing Compatibility: 0x00020041
AA Behavior Flag: None
AA Mode: Override application settings
AA Setting: 16x CSAA (4 color + 12 cv)
Transparency AA: Multisampling disabled, 8x Supersampling (don't use sparse grid, it's ***)
Anisotropic Filtering Mode: User-defined
Anisotropic Filtering Setting: 16x
Anisotropic Filter Optimization: On
Anisotropic Sample Optimization: Off
Negative LOD Bias: Clamp
Texture Quality: High Quality
Ambient Occlusion: Disabled*
Maximum Pre-rendered frames: 1
Threaded Optimization: On
Triple Buffering: Off
Frame rate limiter: 58**
Vsync: Adaptive
*Reason being: Screen space ambient occlusion is pretty ***. I dislike the shimmering on foliage and other environmental edges. If you turn it on, keep it set to Performance as the difference between Quality and Performance is minute, basically unnoticeable aside from a 20~30FPS drop.
**May only be necessary with kepler GPUs (670, 680, 690). Adaptive vSync can cause stuttering at capped FPS as well as some input lag, however when frame rate is limited to below your refresh rate (58 or 118) these problems are alleviated. Limited framerate + adaptive vsync > regular vsync + triple buffering.