two video cards / The first one is / plastered in what looks like 9 GPUs, two are XILINX

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Xilinx make Field Programmable Gate Arrays. Probably some custom glue logic to tie it all together.

the rest are "SRU ITI" / TC17G042ATs. It has seven non-removable RAM boards, each with eight NEC D4146AL-BD chips. / Made by Imaging Technology, inc. model VP1300-AT. /
The other card is an MicroImage Video Systems Co. Model I RGB. / The last video card is / TECHMAR PC-Mate Video Van Gough

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Searching part numbers on Google is an exercise in futility these days, so if you want to do some research on those ICs, I suggest http://www.octopart.com.

They sound like very high end cards for the day. Any idea what bus they're made for? The dates are pre Nubus, PCI and probably ISA as well. Maybe S-100? Apple II?