> isn't the "e500" kind of a slightly evolved/souped-up "G3" and running at higher clock?

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6313&forum=11&start=3

> the x16 slot only has [...] connected [...] 4 lanes. But the data sheet [...] speaks about
> many controllers but *not available simultaneously* (depends on HW configuration perhaps?),
> so with the known other features of the Tabor, does x4 lanes for graphics sound reasonable?

Yes, it sounds reasonable to me that one of the three PCIe controllers uses four of the six SerDes lanes.

> it should offer about the same GFX bandwidth as the AGP 4x available in
> most of the decade old Mac HW that most of us use with MorphOS, right?

Yes.