Interesting point. I don't know what the pricing was, but the Thunder/24 was about two years older. Did production continue as a lower cost alternative? It's from the G-World RAM era and could have had a higher price tag than the later series at introduction despite its lower specs. Capabilities change, but tech level and pricing seem to operate on a different timeline.

It also seems more likely to me that the Thunder II GX series was designed around a DSP board already in the product lineup that was time tested and in no further need of development. I've not seen a good pic of that daughtercard before. Is it the same as the one on your Thunder_II_GX_1600, oP? Are there components on the solder side of the DSP board? it's the only daughtercard I recall having a cover, is it insulation only or a combination of that and RFI shielding as we//?

Are those 9 ICs DRAM? would that be a parity setup for funneling the output of the two(?) DSPs to the controller ASIC? I need to compare it to the 4 DSP card on my Radius_Thunder_IV_GX_1600. Is there any chance we can get scans of both SuperMac cards uploaded to 'fritter's NuBus Mafia? I think we all need to revisit/revitalize that project.

Cool stuff!