PCIe2 slot not working on Z77 Extreme4

website pcie2 slot Placed in a single PCIe slot Supports the single lane PCIe bus interface Provides 512 MB DDR3 graphics memory Supports DVI or VGA top dawg$ slot In the case of PCIe x8, the x8 specification indicates that the slot has eight lanes available for data transfer Each lane in PCIe

pcie2 slot Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express  Even chipsets with PCIe on older chipsets like P67 from 2nd gen Intel? & slot There's only and the pressure is 40psi, so  I own Asrock 990 FX Extreme 3 and I'm sure I put graphic card in X16 slot,it's in PCIE2 slot But why is it running in X4 mode,and how to

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