Which data is NOT carried by the expansion bus?

The expansion bus primarily serves as a communication pathway that allows peripheral devices and other components in a computer system to connect and exchange data with the main system. It is responsible for transferring data related to peripheral devices, input/output operations, and graphics data.

System memory, on the other hand, refers to the RAM installed on the motherboard where active data and programs are temporarily held for quick access by the CPU. The CPU communicates directly with the system memory via the memory bus rather than through the expansion bus. This distinction is important as the expansion bus does not typically carry the data associated with the main system memory, focusing instead on connecting additional components that are not part of the core memory architecture.