Radiator change

[Ticonderoga]

I'm not seing very good temps with my current water setup.
I am using the HW-Labs black ice GTS 360 Xflow rad with an I7 970 @ 4.1 ghz and a Hd7950 @ 1040 / 1440.
The gpu easily hit temps in the 60's and the cpu in the 70's during BF3 gaming and since I will be adding a second HD7950 I'm worried that my temps will rise even more.
So I'm think about switching radiators and have looked at the alphacool nexxxos xt45.
Any ideas as to how much the rad change will affect my temps?
'

 

[Tea_Bag]

what fans and speed are you using? what's ambient temp in room?

 

[Ticonderoga]

I'M using the noiseblocker multiframe fans at max speed. Ambient temp is 22 celcius.

 

[Avathar77]

You should see an improvement.
For one you will be able to run your fans at a much lower rpm to get the same results(as the GTS has higher fpi than the XT45).