PCI-E 2.0 link width at x8 instead of x16

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I'm using a Z68 Extreme4 Gen 3 motherboard and according to CPU-Z, the port with which my GPU is plugged into is running at x8 yet the max. supported is x16?

Is this right? Should it being this? Should I increase it?

 

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Which one of the PCI-E 16X slots is it in? top or bottom?

Out of the 3.0 ports it's in the bottom one.
Out of all the 16X ports (2x 3.0, 1x 2.0) it'd be the middle one.

 

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Thanks for the help everyone. It's showing 16X now on CPU-Z.