http://www.hardocp.com/article/2011/...ing_technology

FXAA stands for Fast Approximate Anti-Aliasing. It does exactly what it sounds like. It is a higher-performance approximation of the effects of traditional Multi-Sampling Anti-Aliasing. It is a single-pass pixel shader which runs in the post-processing stage of the target game’s rendering pipeline. It is designed to be faster, and have a smaller memory footprint, than traditional MSAA, but with some compromises in precision and quality.

FXAA also has advantages, including the reduction of specular aliasing and sub-pixel aliasing (aliasing that happens when surfaces are rendered smaller than a single pixel, which makes them flicker). In his whitepaper (PDF) at developer.nvidia.com, FXAA creator Timothy Lottes claims that the cost to process a single 1920x1200 from on an NVIDIA GeForce GTX 480 is under one millisecond for FXAA preset 2, which stands in the middle of the technology’s performance/quality compromise.

This would be great to have a smaller Video Memory foot print sense at 1440x900 with 8XQ MSAA considering my 560 GTX Ti with everything on runs at 980MB of v-ram