During GUI install my Diamond Viper 550AGP is recognized as rivaTNT, alltough the Viper550 is also in the list. The memory is detected (?) as 256kB , should be 16 MB ( in TUI it is preset at 8MB ). It is a TNT based card and it works, but it would be nice to list it by it's real name.
As for the card name, that is foremost a convenience for people manually specifying their cards. As it is a TnT-based card, this is not a bug. As for the memory detection (done by kudzu), the Nvidia cards doesn't seem to return the correct values all the time - mostly they seem to return "4 MB" on this VESA BIOS call no matter what they have.