Is my GPU being bottlenecked? Worth buying a new CPU?

Hi, my current setup is a Sandy bridge Intel-Core i7 2600 with a Gigabyte GA-B75M-D3H Motherboard. I am currently using a Galaxy GTX 770 as my GPU in the PCI 2.0 x4 slot. My VGA cable is plugged into the video card and NOT into the on board VGA port. I am thinking of getting a new CPU (Intel-Core i5 3570k) so I... show more Hi, my current setup is a Sandy bridge Intel-Core i7 2600 with a Gigabyte GA-B75M-D3H Motherboard. I am currently using a Galaxy GTX 770 as my GPU in the PCI 2.0 x4 slot.
My VGA cable is plugged into the video card and NOT into the on board VGA port.
I am thinking of getting a new CPU (Intel-Core i5 3570k) so I can put my GTX 770 into the PCI 3.0 x16 slot.

My question is, is my GPU being bottlenecked as it is in the 2.0 x4 slot? And is it worth buying a i5 3570k?
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