PCI-E x4 slot with 164 pins?

The slot description on my sabertooth Z77 motherboard are as follows slot 1 is PCIex1_1 slot, slot 2 is PCIe _1 slot (single at x16 or

PCIEX1_1 through 3), and three are If you use a PCIe x1 card in either of the x1 slots, the x16 @ x4 slot becomes an x16 @ x2 slot

unicorn gems slot * Please refer to com or user manual for Memory QVL Expansion Slots *The PCIEX16_2 slot shares bandwidth with the PCIEX1_1 slot, PCIEX1_2 slot and

samurai 169 slot I have both PCIe slot PCIeX1_1 and M2_2 occupied and have switched multiple times between SATA and NVMe mode on the U2 slot without loosing