Das findest du auf der Opti-Seite:
Audio Card Drivers
OPTi sold its audio chipset business in 1997. Please keep in mind that even prior to 1997, OPTi never made sound cards. We previously sold chips for these cards to other companies, who are responsible for providing and updating drivers. OPTi does not offer any audio drivers. If you need technical support or drivers, you will need to contact the company that made your sound card.
If cannot locate a driver from your card manufacturer, we strongly recommend that you install a PCI-based audio card. They are readily available for under $30 (often under $20).
Also, Opti stellt seit 1997 keine Audio-Chips mehr her. Die empfehlen ganz einfach den Kauf einer billigen PCI-Soundkarte.