Possible to build PC based frame buffer using PCI 6111?

I'm considering building a variable scan rate, passive capture frame buffer for Scanning Electron Microscopes. There are no off the shelf frame grabbers that support the clock rates I need and so I'm considering building a line grabber with a DAQ style device and building a frame in PC memory. Has anyone done this. Does the 'setup and run' support of a a PCI-6111 support grabbing video lines in rapid succession and then DMA'ing them out before the next video line comes in? Pixel clock is about 38KHz and 640 samples per line.

Rick Walton,
I noticed that I failed to post the link to the product spec page for the PCI-6111 (it can be found here).
The PCI-6111 can handle sampling rates up to a maximum of 5MS/s (see NI PCI-6111 User Manual).
The sampling rates are indeed programmable at your desired range.
If you have any further questions please post back. You can also look at the NI PCI-6111 page for specific pricing and purchasing inquiries.
Craig H.
National Instruments

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