You can buy NuBus video cards at Macresq.com and MacWorks.com, although both the 7100's and 8100's came with Apple HPV (high performance video) cards standard in a special Apple PDS video slot. These cards provide very good 2D acceleration with 1MB and 2MB of VRAM in the 7100 and 8100 models resptfully. You're not likely to get much better performance out of any NuBus card for a decent price. If you have the HPV cards, I'd stick with them.
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Eliott Wolfe
Winnetka, Calif