OC old video card

I have an ATI all in wonder radeon (the first one 32mb ddr, 166 core, 166mem) and i want to OC it just for fun cause im getting a new system in august. anyways, any program i try, when i adjust the clock speeds, the whole screen turns into a multicolor mess as well as locking up. when i restart, the screen is viewable, but still messed up unless i uninstall the oc program. Any help would be appriciated.

I belive that those are based on a rage video card. I imagine the problem is that those aren't meant to be overclocked on the fly, or at all.