Not a whole lot new in this, but it was worth putting out for the additional tweaks given the requests i've recieved on forcing shader versions.
I've added Force Pixel Shader version and Force Vertex Shader version tweaks to the DirectX section. they will allow you to force a lower shader version than your card supports, but, no you won't be able to force 2.0 shaders on your old Radeon DDR...
Note that you must reboot for those tweak changes to take effect.
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System:
AXP2600+
512 ram
ATI 9700 Pro
Pixel Shader 1.4 and Vertex Shader 1.1 forced:
3648 3DMarks
Pixel Shader 1.1 and Vertex Shader 1.1 forced:
3189 3DMarks
With those shaders forced, game test 4 won't run and provides an interesting comparison between the shader versions. Further testing is needed on the 9700, and the 8500 and 9000 results should tell a lot more of the story.
http://www.rage3d.com/r3dtweak