Quote Originally Posted by Johnmark View Post
From what I can ascertain there isn't a whole lot of value in dual loops, but as alway's some will be adamant it's the only way to go. And in your case you already have one loops so maybe that will be the easiest for you.
The advantage of a dual loop is that you can isolate your GPU cooling from the CPU. In comparison to a CPU they don't care much about temps. With automated temperature control your system can also run more silent. For instance at high CPU load it won't be necessary to ramp up the fans connected to the GPU loop and vice versa.