I wanted to get a high-end close-loop water cooler for my new build that has a 4770k, i'm hoping to OC to anywhere between 4.6 GHz to 5.0 GHz. I noticed that the thermaltake water 2.0 extreme suddenly went on sale for $60, which a really sweet deal. Found out that they also have a water 3.0 extreme for $80, i'm not sure what the difference is other than the fact that the 2.0 extreme has a thicker radiator. Is that good or bad? My case is a fractal design r2 XL, so it should be able to accomodate a thicker rad. Is the water 2.0 extreme better than 3.0 extreme? thx!