What is and isn't worth collecting is completely subjective. You have to figure out what it's worth to you.
Some people would say anything non-standard is worth collecting, or anything with Quantum3D's name on it.
Quantum3D had a solution for that in the Sentiris racks using NV17 and NV20, but it required completely proprietary interfaces and card designs to work. These are configured as individual cards using a standard AGP bus, it's unlikely they were interfacing multiple cards over AGP. It is possible they were running data through a compositing FPGA external to the systems running these cards, which could have been stitching things together for a large display.