MOH will report all 128 meg cards as 64.
I have the ATI 9700pro and get very good FPS. I also run my MOH a very high res.
Make sure you deleted and removed all your old video card drivers. Check out :
http://www.rage3d.com/
on how to uninstall your old drivers and the correct procedure, for installing your new drivers. I would also recommend, DX9 and cat3.1
Good luck, you should be seeing much better fps then what you listed.