Voila je sais ce que ca fais ! et je ne le mets pas !
Side band addressing. Side band addressing (SBA) enables AGP to use 8 extra (Side band) address lines in addition to the 32 main ones to transmit requests for data, which should further improve AGP performance. Those of you with PCI Graphics cards can ignore this option, or even Untick it altogether. When Grayed out SBA support will be automatically determined, though should you wish to force it be sure to Tick this option. NOTE ? On some systems this can cause stability problems.