Hi.
There were lots of differently made Nova-cards. Most (or all) were Mach 32 or ET 4000 in different sizes. Each card needed special gal-proms to work and a special version of the software. Just got a Nova and it works fine with the third driver package...
As for Nvdi: my version 4.11 works perfectly for me. And Nvdi 5 still costs a lot if you order it from ASH... :-/