MSI 660ti OC PE in GA-Z68A-D3-B3

The description on New Egg states that this card requires PCIE 3.0 (http://www.newegg.com/Product/Product.aspx?Item=N82E168...)

The description of my motherboard (Gigabyte GA-Z68A-D3-B3) by its manufacturer states that:

1 x PCI Express x16 slot, running at x16 (PCIEX16) (http://www.gigabyte.com/products/product-page.aspx?pid=...)

New Egg states the Motherboard has: PCI Express 2.0 x16: 2 (x16, x4) (http://www.newegg.com/Product/Product.aspx?Item=N82E168...)

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So my question is: Will the 660 ti work in my machine?

If so, Is it more complex (with regard to jumpers, settings, bios, anything) than simply physically unplugging the 560ti and then connecting the 660ti?

If not, Will there actually be a 10-20% performance increase or will the PCIE 2.0 hamper it?

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The long and short is: I had been looking at the card and then my buddy said he'd buy the 560ti off me. So the upgrade to the 660ti is potentially only about $200.

I just don't want to buy something that won't work/won't actually be an improvement because my motherboard is a year or so old.

Thanks.