So basically I have PCIe 3.0 x16 slot on my motherboard. And a graphic card. Seems normal, right? But my consern is that any modern GPU uses only half of the PCIe 3.0 x16 bandwidth (8 of 16 lanes (works only on PCIe 3.0, on PCIe 2.0 it uses all lanes)). So why isn't there any adapter that could turn PCIe 3.0 x16 slot into two PCIe x8 slot, so I could plug GPU into one slot and something else into other slot, e.g. M.2 card or extra USB hub. Also, could it be possible to plug another GPU into that second slot (if a motherboard supports CrossFire or SLI, obviously)
From what I understand based on the PCIe pin-out scheme (e.g. this one: http://www.interfacebus.com/Design_PCI_Express_16x_PinOut.html) first few pins in the PCIe connector are responsible only for delivering power and other not very importand data (e.g. SMBus clock and data) to the PCIe card. Can somebody explain to me all my concerns and correct me if I'm wrong?
PS Sorry if I'm posting in the wrong section.
From what I understand based on the PCIe pin-out scheme (e.g. this one: http://www.interfacebus.com/Design_PCI_Express_16x_PinOut.html) first few pins in the PCIe connector are responsible only for delivering power and other not very importand data (e.g. SMBus clock and data) to the PCIe card. Can somebody explain to me all my concerns and correct me if I'm wrong?
PS Sorry if I'm posting in the wrong section.