Originally Posted by ProRules
Better to do Pump/rez > 240 RAD > CPU >240RAD > GPU>pumo/rez
The water temperature does not change by much as it goes through the loop. In fact:It takes 264W to raise water at 1GPM by 1°C
That means that even if your 200W TDP GPU was working flat out it would only raise the water temperature by
200/264 = 0.76°C
For most people that small a change in temperature is not worth re-routing the tubing to avoid. Not to mention that the extra tubing and bends needed may well drop the flow rate and negate any gains in temperature.
True, if you had 3 or 4 high end GPUs then you would probably want to put them after the CPU - 2.3 - 3°C becomes worth bothering about.