Okay so my mobo...the asrock pro3 gen3 supports pci-e 3.0 and everything but my old graphics card: the hd 6950 didn't support that. But my new one, the gtx 670 supossedly supports pci-e 3.0 so after hooking it up to the cords my hd6950 used to be hooked up to...bam no pci-e 3.0??? I don't understand why it' still saying pci-e 2.0x16 in gpu-z. Here's a screenshot of gpu-z.
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See the ? to the right of the Bus Interface display field?
Click on the ? and then click on the Start Render Test command button of the Render Test popup window. See if the Bus Interface display field changes.
It should display PCI-E 2.0 x16 @ x16 2.0
you need a ivy bridge processor to run the card on pci-e 3.0(the gain of pci-e 2.0 and 3.0 is very minimal)