So, going from Coppermine 952MHz to Tualatin 1568MHz on the CPU has taken the Voodoo 5's benchmark results to the following:
Still seems that we are CPU limited (even at 1568MHz), but my PCI extension cable has arrived so I can now bench "in" the P4 Shuttle.
Now I've got a motherboard capable of running over 112MHz FSB I thought it would be a good opportunity to try my actual PIII Tualatin (1133MHz/133fsb) in the iP3/T adapter. This will happily run at 150fsb/37.5pci at 1275MHz (maxing out the board, 150fsb is as far as it goes). It actually eeks out the Celeron Tualatin running at 1568MHz (I guess the increased cache and the faster memory speed make up a lot of the raw CPU clockspeed shortfall).
3DMark2000
V5/Pentium 3 850: 3846 3DMarks
V5/Tualaron 1400: 4274 3DMarks
V5/Tualaron 1568: 4659 3DMarks
V5/Tualatin P3 1275: 4662 3DMarks
V5/Pentium4 3GHz: 4802 3DMarks
Quake 3 Arena (32-bit textures and colours):
V5/Pentium 3 952/640x480: 76.3fps
V5/Tualaron 1400/640x480: 90.8fps
V5/Tualaron 1568/640x480: 100.7fps
V5/Tualatin P3 1275:/640x480: 108.1fps
V5/Pentium4 3GHz/640x480: 162.7fps
V5/Pentium 3 952/800x600: 76.3fps
V5/Tualaron 1400/800x600: 90.0fps
V5/Tualaron 1568/800x600: 100.0fps
V5/Tualatin P3 1275:/800x600: 107.4fps
V5/Pentium4 3GHz/800x600: 138.9fps
V5/Pentium 3 952/1024x768: 73.9fps
V5/Tualaron 1400/1024x768: 88.4fps
V5/Tualaron 1568/1024x768: 97.5fps
V5/Tualatin P3 1275:/1024x768: 103.3fps
V5/Pentium4 3GHz/640x480: 112.7fps
I don't think it would take much additional clockspeed for a Tualatin based CPU to beat the P4 at 3DMark2000, perhaps 1350MHz~ at 150MHz FSB. Clearly the issue with Quake 3 is lack of CPU grunt still, even with the FSB/RAM boost to 150MHz the Voodoo 5 is data-starved.