DX problems

[Spunky2000ca]

Ok, we've all heard "why doesnt my DX work with Graal?"
and sorry but, im asking that question now.
I have the Disable Direct X7 option clicked. I know that disables it, obviously. But when i have it unchecked, theres no difference. Ive put the fullscreen on 1027x768 and 24 bit color. And that is the only time i can see anything. Even then, I only see half of the effects. Sorta like somone cut the lights in half and removed one half. And i lag like heck. (heck= not allowed to use "bad" words :P )
Anyone know how to solve this problem?
Also, I have a voodood Banshee card. I've heard rumours that it doesnt work with voodoos, but why? and if so, i wouldnt mind having that rumour turned into a fact. Thanks