PCIe2 slot not working on Z77 Extreme4

PCIe2 slot not working on Z77 Extreme4 pcie2 slot PCIe x1 Slots are the smallest of the four PCIe slot standards for motherboards! PCIe , 5GTs, 500 MBs, GBs, GBs, GBs PCIe , 8GTs the phantom slot You can use the 16x card in the first 4x slot it's ok, the slot is open at the end Press Enter

link hack slot Placed in a single PCIe slot Supports the single lane PCIe bus interface Provides 512 MB DDR3 graphics memory Supports DVI or VGA