If you are looking for a serious waterblock on the GeForce GTX 680, then Koolance might have an answer for you with a full coverage water block for NVIDIA's current flagship graphics card.
Named VID-NX680, Koolance's block weights 680 grams and features G 1/4" threading, an Acetal top cover and a 'high-performance microfin (0.5 mm) design made of solid copper with anti-corrosive nickel plating.'
The VID-NX680 is selling for $119.99.
