does anyone know if a GeForce 4 Titanium MX (4x AGP capable video card) will work with an AGP Mac (2x AGP capable)? will the GeForce 4 Titanium clock down to 2x AGP and work just fine? if so, is there any real advangate with with it over an ATI 8500? i've got a friend that just upgraded his video card and he wants to sell me his old GeForce 4 Titanium (MX). i've got an ATI 8500 in mine currently but i'm a gaming buff and i'd like the extra speed & power if it'll work. any hints or comments would be MUCH welcomed, thanks ...