A PC bus, also referred as “the bus,” is the path on the motherboard a PC uses to transfer data to and from the CPU and other PC components or other PCs. This includes communication between software. For example, a PCIe (peripheral component interconnect express) expansion card, such as a graphics card (aka GPU aka video card), will send data to and from PCIe bus.
- eSATA (External SerialATA) – for transferring data between external hard drives and disk drives
- PCIe – for accessing PCIe expansion cards and certain M.2 SSDs
- SATA (Serial ATA) – for accessing internal storage drives. Slower than PCIe
- Thunderbolt – for accessing peripherals
- USB – for accessing peripherals