If you're itchin' to hook up your almighty GEFORCE GTX 680 (or two) to your existing waterloop, Koolance now has a decent looking block for you to consider. The company has just released its VID-NX680 water block to suit NVIDIA's current flagship card.
This block runs dimensions of 6.25" x 5.75" x 0.62" (WxHxD) at a weight of 1.5 pounds (680g). It features an Acetal top cover and a high-performance microfin (0.5mm) design made of solid copper with anti-corrosive nickel plating. It uses standard G 1/4" threading and there are connect nozzles available from Koolance to allow for a pair of them in SLI configurations.