Quote Originally Posted by Biffa View Post
Agreed, sorry if I confused anyone, but I meant 7°C on the entire loop would be important for me, especially if the loop included an i7.
If the GPU temps is higher, it doesnt mean the water temp is higher ! 7C more on the GPU wont affect other component temperatures, actually could be the water is even cooler due to less efficient heat transfer from the waterblock. Dont mix up the component temperature and coolant temperature...
Actually the flow restriction will affect more seriously the rest of the loop.

Quote Originally Posted by Biffa View Post
In a GPU only loop, maybe/maybe not. I haven't seen any Fermi blocks not able to keep a thrashed GTX480 sub 60° and a GTX470 sub 50° (depending on ambient of course)
And i have yet to see any significant difference in GPU overclocking using room temp watercooling, be it 40 50 or 60C... You have to go chilled or subzero for that.