Radiator placement important?

[mkim797]

I accidentally posted in the regular OC and Cooling forum, so I am reposting here (sorry for the double posts everyone).

I'm working on a water-cooled dual opteron, dual gpu system. I am a little worried about the amount of heat the pump might put into the system (I am thinking of using a Gormann-Rupp pump). I was toying with the idea of putting the radiator inline directly after the outlet on the pump rather than before the reservoir so that the coolant can be returned to a temp as close to ambient as possible without being reheated by the pump. Anyone have any experience with this? Would this provide any advantages/disadvantages?

One person mentioned that the water temperature doesn't vary much throughout a water-cooled system. I am assuming that from this statement, it probably doesn't matter if I put the radiator directly after the pump or right before the reservoir?

 

[Lite_User]

It depends on the waterblocks your using.
If you have restrictive blocks, it's not a good idea to put the rad before your blocks.
That's what most people would say.
But I have installed 2 rad's, one like you proposed (after outlet pump) and the second after the blocks.
I have no problems with flow or pumphead, because my first rad is very low restriction,
the second one is a black ice extreme.

But with your setup it's best to install the rad after your blocks.The normal way...

Don't mind the pump heat to much, in ratio, a better pump wins over a few extra Watts.(I think that's true in most cases)
And opens the possiblity to installing a second rad.

Good luck

Grtz