<Tr> <Th> 30 </Th> <Td> Reserved </Td> <Td> HSIn (3) </Td> <Th> 81 </Th> <Td> PRSNT2 #</Td> <Td> HSIn (15) </Td> </Tr> <Tr> <Th> 31 </Th> <Td> PRSNT2 #</Td> <Td> Ground </Td> <Td> </Td> <Th> 82 </Th> <Td> Reserved </Td> <Td> Ground </Td> <Td> </Td> </Tr> <Tr> <Th> 32 </Th> <Td> Ground </Td> <Td> Reserved </Td> </Tr> <Tr> <Td_colspan="4"> PCI Express × 4 cards end at pin 32 </Td> </Tr>

What is pci express 3.0 x16 used for