I have two video cards in my computer...one has enough memory to function as a CUDA device, the other does not. Boinc sees them both, but for some reason, chooses to use the smaller one, which then errors out with "your nvidia gpu has insufficient memory..."

Here's the desc. of both

http://mars.sscorp.com/capture.png

Is it possible to chose between two CUDA devices?

Yes, it is. You'll have to set up / edit cc_config.xml in your BOINC data directory to contain an <ignore_cuda_dev> option with the correct device number. That would be 1, regarding your picture.

I'm not sure if an additional <use_all_gpus> is necessary.

Gruß,
Gundolf
PS: You don't need to capture a screenshot, just highlight the lines in the Messages tab and copy&paste them here.

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Computer sind nicht alles im Leben. (Kleiner Scherz)

Interesting to see that BOINC has chosen the nForce 750a as the 'better' device, when the only thing it has going for it is the compute capability 1.1

Memory is, as tgtcat6 has found, too small, and as for speed....