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D3D11_FILL_WIREFRAME order of magnitude slower with 3xx.xx drivers?

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Has anyone else noticed that D3D11_FILL_WIREFRAME is an order of magnitude slower on 3xx.xx drivers for 480, 580 and 680 cards no matter what the render state is?
The nvidia drivers have become so incredibly unstable in wireframe on consumer cards that I resorted to geometry shaders for reasonable performance several months ago. I was merely curious.

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I never noticed any performance issues, but I definitely noticed that something changed 301.46 that made wireframe render differently. At work we have a suite of automated tests that use image comparisons to check for failures, and all of our tests with wireframe and line rendering failed when we updated our drivers.

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