If I understand it correctly the "Q" is for "Quadro" and it has optimizations for OpenGL etc.
I have not tested the M2070 with vSGA but I suspect that is will not work as Nvidia is specifying PCI-ID in the driver and also outlines the Q card in their release-notes for the driver.
Its the same issue with the "K" cards, for example Quadro 4000 works fine but the Quadro K4000 does not.
But if you have the components already it is maybe worth a try just to make sure.
// Linjo