I think a detail is being overlooked here.
R200 does not have 3 TMUs per pipe. R200 is 4 pipes, 2 TMUs each. Only R100 (Radeon) and RV200 (Radeon 7500) and their derivatives use the 2*3 pipes/TMUs layout.
Does anyone have any evidence to the contrary?
No. It has 2 TMUs per pipe and 3 pipes. Each pipe can be independently programmed. This gives a total of 6 application usable texture units. Now, there will be a performance hit each time the app goes from 2n to 2n+1 texture units. Look near the bottom of the Radeon 8500's entry on delphi3d for further proof. It lists 'Multitexture Texture Units 6'.
http://www.delphi3d.net/hardware/viewreport.php?report=690
The R100 chips have 3 TMUs per pipe and 2 pipes, but the pipes are not independently programmable. That gives a total of 3 application usable texture units.
http://www.delphi3d.net/hardware/viewreport.php?report=686
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