Some common bus speeds:

USB 2.0 60MB/s   - 480 Mb/s
USB 3.0 640MB/s - 5 Gb/s

32 bit PCI 33Mhz 125 MB/s   - 1 Gb/s
PCI Express 2.0    500 MB/s   - 4 Gb/s per lane
PCI Express 3.0    985 MB/s  - 7.88 Gb/s per lane

SATA      150MB/s - 1.2 Gb/s
SATA 2   300MB/s - 2.4 Gb/s
SATA 3   600MB/s - 4.8 Gb/s