If the small one can displace the heat you are throwing at it, there would be no difference. The question you would have to determine is how many Watts the radiator can effectively move away. I have a small Senfu radiator. It allows me to have some great temperatures and its just a little small thing. BrianW is using a gargantuan rad. I don't understand how the temps could be much better, but no once corrected him during his post of his magnificently crafted dual rad. However with the variables of air to the rad, and use of fans its a loaded question.
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