sentences:  Intel 6 Series Chipset and Intel C200 Series Chipset Specification Update from google (intel h61 revision 05) result 1 under 'pch device and revision identification' page 13, says '05h' is located under 'b3 rev id' so 'b3' is the chipset stepping version.Suffix "h" means hexadecimal so '05h' means 5.With Sandy Bridge, Intel has tied the speed of every bus (USB, SATA, PCI, PCI-E, CPU cores, Uncore, memory etc.)