Technically none. All Nvidia cards from the 8xxx series and up don't have any pixel pipelines. They moved from that architecture to whats called a Unified Shader Architecture. A pixel shader in a Pixel Pipeline can only shade a pixel. Using the USA, the "core" can shade either a pixel or a Vertex. If its a DX10 card it can also be a Geometry shader, or if its DX11 it can also act as a compute shader.
This is better then the old way because they used seperate Pixel and Vertex shaders. There could be times where the pixel shaders which far outnumbered the pixel shaders were doing nothing while the few vertex shaders were working extra hard. The math is similar enough that they could have been working, but due to the API they weren't.
The answer to your question is 32btw.
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