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Basically something like a Black Ice GTS 360mm vs an RX240, what would be a better option and by how much?
 

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RGBKB.net
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Assuming each fan is 50cfm and disregarding boundary layer creation down the heat exchanger, we can do some rough math.
GTS 360:
360mm x 120mm x 30mm x 30FPI x 150CFM = 5832
RX240:
240mm x 120mm x 46mm x 13FPI x 100CFM = 1722

In no way do I believe the GTS 360 will dissipate 3.3 times more heat, but I do believe it will be better by some noticeable margin. The extra fan and higher fan density really helps.
 

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Shooting down fallacies
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Simply put - 360GTS will offer better performance and the ability to run the fans at lower speeds for less noise. Surface area on the face of the rad means far more in terms of performance than thickness.
 

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IF you can fit a thicker 360 i def would. The jump from a 360mm 30mm to a 45+mm thick rad makes quite a difference, more so then going from a 45 to a 60+. IF you cant fit a 360 45m then yea def go for a 360. Surface area matters way more then thickness.

Rough estimation 240mm cant dissipate 200w for a delta of 10°C while a 360 is about 300w or so same temp. Meaning for a delta of 5°C a 240 will only dissipate 100w while the 360 will dissipate 150 (basically your average i5 i 7 cpu oced)
 
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