what is the blue thing on Gigabyte's MB that says 'Turbo-3D'?

I just ordered a replacement MB from a private seller on ebay - the MB is a GA-880GM-UD2H and it looks like there's a problem - the blue heat sink that says 'Turbo-3D' is loose. There are 2 spring loaded pins on either side of it that you can press down but the thing doesn't come off. I'm wondering what this thing is and if it may be damaged. Also, I'm wondering if someone could recommend another board similar to this one that I can replace it with. I think this one is discontinued or at least I couldn't find one anywhere new for sale.
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