Originally Posted by creidiki
extra fluid does nothing for temperatues, just takes a little longer (minutes, unless you add many many gallons) for temps to reach stability.
the problems with extra rads, and the reason why they dont perform as well as bigger, single rads are:
- restriction scales geometrically instead of linearly. with a bigger rad compared to a smaller rad of the same model, the restriction from barbs & tanks is the same, and you only have the added restriction of the extra internal tubing.
so say, a triple will have (made up numbers here) 30cm pressure drop @ 1gpm, double will have 35cm, and triple will have 40cm.
with multiple rads, you'd have have 30cm for one, and 60cm for 2.
the end result is a measurable loss in flow loop-wide, with related loss of efficiency for components.
- on top of that, heat transfer efficiency is directly related to temperature delta, but it doesent scale linearly. with rads one after the other, the 2nd one will be far less effective, even if theyre both breathing cool air from outside the case.
if you put them in different places around the loop, they will both have smaller deltas and lose efficiency.
the 2 together mean that unless youre using TECs, multiple rad's advantages will balance out their disadvantages and you end up with the same temperatures as before.