MEG Z690I UNIFY what's the connection between PEG and PCI?

MEG Z690I UNIFY what's the connection between PEG and PCI? peg slot peg - tube S is the main cam at opposite end of driving - shaft from the slot of the face pegasus 77 slot Which bios setting is the right one between Auto, PEG and PCIe? Besides the GTX 680 I dont have anything else connected to Pcie slots Thank

peggy sweets slot UBERSWEET® Guitar Bridge End Pin Peg+String Winder+Slot Saddle Nut for Acoustic Guitar : : Musical Instruments