Heres my 2 cents...
I don't think the idea is so bad actually. I don't see why you could not make the water circulate so that the temp in the tank will be on average the same as the water going to the CPU. You just have to figure out the best places to put inlets and outlets.
IMO Pros:
+ You remove the restricting radiator from the CPU-loop giving you better flow in that loop.
+ Less noise than if you would put the the two pumps in the same loop as everything else.
+ You could easily double or tripple the rads without bothering about the restriction to much because the CPU flow will not be affected.
IMO BIG con:
The bigger the temeperature difference between the watertemp in the radiator and the ambient temperature, the better cooling effect. By putting the rad in the same loop as the CPU, after the CPU, you will have the hottest water of all the system running through your rad.
With your idea, you will not have the hottest water running through the rad, but it will be mixed up with the tankwater... So as I see it you will loose some cooling effect on this setup... But hey... You can get double rads to compensate for that.
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