Actually it depends upon your taste well if your contented in software rendering fine but if you want to see crisp 3d images then buy a 3d acc. BTW is your videocard a s3 Trio 3D/2X 8MB
The simple answer is yes. A good video card is needed to enchance ePSe graphics.Is it really necessary to have a good video card or 3d accelerator in order to enhance ePSXe's graphics?