DirectX: Large texture transfer gpu->cpu limited by display resolution

I want to move a large texture (2kx2k) to the video card and perform some image processing via the GPU and then move it back to the system RAM. At this time I am having a problem in that what I get back from the Video Card is being limited by my display size in Windows. So if my display size is 1280x1024 in windows I will only get back a 1280x1024 chunk of my 2048x2048 texture back.

Does anyone know how to get the full texture back to system memory independant of the windows display resolution?
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