Why would you get a liquid cooled gpu? It doesn't really do anything. I can see why someone would get a liquid cooler for their cpu but for a gpu?! Why?! Get something different like this one http://www.newegg.com/Product/Product.aspx?Item=N82E16814130781.
Because watercooled GPU's scale much better than CPU when it comes to temps.
A full cover block will cool memory, VRM's, etc which allows for much higher overclocks, not to mention a quieter and overall better looks.