Shared PCI Express lanes: PCI-e x1 board plugged into x8 slot that is shared with x16 slot
Posted on 2013-11-13
I have a Gigabyte motherboard GA-Z68X-UD3H-B3. It has two PCI Express x1 slots, one PCI Express x16 and a PCI Express x8 slot. The manual for the motherboard says "When the PCIEX8 slot is populated with a PCI Express graphics card, the PCIEX16 slot will operate at up to x8 mode. I have a video card in the x16 slot. Unfortunately the x1 slots are on either side of the video card and thus I can't put the audio card on one side because it blocks the fan of the video card so I put it on the other side. I then have this Media Dashboard front panel device that has USB 3.0 ports but they connect to the MBD via a PCI Express x1 slot. But I can't plug this connector into the x1 slot on fan side of the video card because the fan blades hit it. Thus I'm left with plugging it into the x8.
So, here's my questions:
1.) If I plug this x1 connector, basically USB 3.0 front panel ports, into the x8, which the x16 slot with the video card drop down to x8
2.) Will I just loose a lane on the x16 slot? I guess you just don't loose one lane though?
3.) Will nothing happen because the x1 will have no effect on the x16 slot since it's not another video bd.
4.) If performance is affected in anyway, will it only be affected when something is plugged into the USB 3 front panel port.