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PIX and large textures

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I have a volume texture 512x1024x128. My Geforce 8800 GTS has MaxVolumeExtent = 2048 according to Caps Viewer. The volume renders fine, but when I try to debug using pix, I get an error in PIX "Error in call data" at the point it tries to draw the volume, and I have discovered that the problem line is the one that sets the volume texture to the effect. If I switch to a 512x512x128 volume, then PIX works fine. Would PIX have an issue with larger volume texture for some reason?

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