I would go
res>pump>lower rad>GPU>CPU>upper rad>res

I would NEVER take scalding hot water from a GPU and pump it into a CPU...without going thru another RAD first ^^

I dont think it really matters
The water is going to heat up/cool down pretty slowly and evenly
The temp of the water remains about the same in the entire loop it might be 2c hotter coming out of the GPU vs coming out the radiator
But pretty much will be the same temp
think of the water as a massive heatsink

The temperature would be maximum 1c block to block.
i run all my blocks in serial and the temperatures hardly varies.

And my serial is res>pump>rad>cpu>tri-sli>res

This post was edited by Battleship on Aug 3 2012 05:18am

bro no offense...but if that's the case then why even use RADS ^^

Well you still need to cool the coolant down or else it will just keep going up in temp.
That would be like using a massive heatsink with no fins on it
It would be fine for a few mins but it will heatsoak after that
My GPUs vary 1-2c across all of them normally the LAST ones to get the coolant are the coldest for some reason

The more radiator space you have the cooler a WC setup will run overall

then RADS are useless....and should be outside the case...


going from GPU to RAD then CPU has GOT to be cooler for the CPU...and man I'mm glad I use air cooling lol

in simple i think its somthing like 250w roughly to heat up water 1*

seeing as the water is pumping rather quickly through both the rads the order of it all is rather not concerning at all.

like battleship stated all that really matters is pump after res.

They should be outside the case for ideal temps for other parts of your case like HDDs ect
GPU>Rad>CPU might be 1-2c cooler but
You need to understand that the coolant is not fully cooled or even close to it on one pass of the radiator
If am running calculations on my setup for a few hours and then stop it.
The cpu/gpu temps stay above idle temps for 30mins or more.
This would be like on air say your gpu is running 80c full load then you quite the game or w/e and it slowly drops to 35c over 30mins.
Also happens the same way on startup or going from idle to full load
It slowly warms up after maybe 10mins its full temp
Say I load up something for 1 min the coolant temp will not go up much because it does not have much time to raise the coolant temp.