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Old 08-18-06, 11:54 AM   #19
NVIDIA Corporation
Join Date: Dec 2004
Posts: 8,763
Default Re: Poor Xinerama Performance

When using TwinView (and performance is good), do you see this warning (or something similar) in your X log?
(WW) NVIDIA(2): The GPU driving screen 2 is incompatible with the rest of the
(WW) NVIDIA(2): GPUs composing the desktop. OpenGL rendering will be
(WW) NVIDIA(2): disabled on screen 2.

Adding a PCI card to the mix would likely reduce performance if you also had an AGP card because the PCI card is a bottleneck.

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