On Windows 98SE the M&M games run with any version of Diect X. If you go over evrsion 8, you may (or may not) lose the music tracks, but the games still run with all other sound funtioning normally.On Windows XP, things get more complex with version 9.0b. This configuration will often make MM8 not run, and MM7 will run like a dog. Not sure about MM6. MM9 seems to work fine on XP with ver. 9.0b though.
Any other experiences are welcome.
And Dave, I can't compare the video cards for you. I know you're a Readeon fan, much as I'm a GeForce fan. Good question though.