The Silicon Image SiI 0680 ATA133 Controller is a Serial ATA (SATA) controller card that supports ATA133 (also known as Ultra ATA/133), which is a high-speed interface for connecting hard drives, optical drives, and other storage devices to a computer. This controller is typically used in desktop PCs, especially older systems, to enable faster data transfer between the motherboard and storage devices.

To use this controller on a Windows system, you'll need to install the appropriate Windows driver. The driver allows your computer to communicate with the SiI 0680 controller and the connected storage devices.