Some applications determine what resolutions are supported by looking at how much on-board memory there is.
No texture memory is stored on the onboard RAM, but instead it is processed and managed by the Texture Management Unit(s) (TMU). The amount of emulated video memory of the selected video card can be changed with this option. The different video cards also presents bias to games which may lock particular rendering capabilities and properties to certain 3Dfx cards and versions of Glide. Some applications and games may need an older card model or older Glide versions, due to the advancements of Voodoo 3Dfx technology made over time. This option allows for the selection of 3D accelerated cards that use the Glide rendering API.
