Hey Robert,
Unfortunately I haven’t found a solution yet. My workaround that I’ll end up doing is getting an Aja card or blackmagic card and connecting the dreamcolor to that instead of directly to the quadro card. Here’s some really useful dreamcolor articles, but has nothing about directly connecting the dreamcolor to a quadro graphics card:
https://provideocoalition.com/index.php/atepper/story/hp_dreamcolor_mac_connectivity_amp_functionality_update_2012a/
If I ever come across a real solution, I’ll post it here. Have you had any luck?
Jen