The I82801 SM Bus Driver refers to the driver for the System Management Bus (SM Bus), which is part of the Intel I82801 chipset (often referred to as Intel 82801 or ICH

In the context of Windows, the I82801 SM Bus Driver is a software package that allows Windows to communicate with the hardware components controlled by the Intel I82801 chipset on your motherboard. This driver is crucial for ensuring that your system can communicate properly with components like the thermal sensors, power management features, and other system components that rely on the SM Bus.