Quote Originally Posted by SERVO20 View Post
they are the 1800rpm version, is that not a good combination?
Nope. Noiseblockers are only "decent" when used to move air either into or out of the case. When they try to move air through something that offers resistance such as a heat sink or rad, they perform very poorly because they don't have the static pressure needed to force the air through. Add onto that the GTS is a rad that requires a lot of static pressure, something more like a Delta fan can produce to get the best performance from it.