I could be wrong here (if so the experts will be along shortly), but there has been simular disscusions over on other boards about this, since the introduction of D3d.
I have 2 cards, A ati radeon 7000, with 32mb & A nvidia Geforce 4 Mx 4000 with 128mb & i can see no perfomance difference between the 2 cards.
Buges