Anthony,
I'm sure there are more elaborate tests available, but at least two are available here on VA: One about a [v5 5500 PCI reacting to PCI OC] and one about a [v4 4500 PCI vs. AGP comparison]. My own knowledge is limited (haven't seriously used 3dfx cards in a long time), but as far as I can remember there were some people here on VA who've done bus scaling tests apart from Raff?
I just can't find the stuff right now.