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Keep single loop or go dual loop for gpu's?

post #1 of 8
Thread Starter 
So, my water loop is built with 1 420mm and 1 280mm BlackIce GTX rads, with 6 140 fans in push-pull for the first and 4 for the second.

I'm going to install 2 6970s with waterblocks so it hit me that it would be nice to do a dual loop...

Now... do you think the 280mm with the push-pull config will be ok for the dual cards?

I have the CPU and Motherboard on the 420 ... or should i "re-tube" everything to get the 420 for the gpu's and the 280 for the cpu and mobo?

Or just forget the dual loop and keep the single loop for everything?
( didn't install the gpu's yet so i don't know how it behaves ... )

Thanks
Pedro
Edited by Pedros - 3/30/11 at 4:03am
post #2 of 8
Well I most definitely think the 420mm is a little too much for just the CPU and motherboard (I know, I run a ThermoChill 140.3)

IMHO, I think you could run everything (including both cards) off of the 420. Your temps won't be fantastical, but it'd work.

Is it possible to have a single loop with both the 420 and 280 rads? (I keep mentioning single loop because buying multiple pumps and reservoirs can get expensive, and this can be alleviated if it isn't necessary.)
Edited by DevilGear44 - 3/30/11 at 4:17am
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post #3 of 8
Thread Starter 
Yeah ... it's possible ... basically i had 2 pumps to optimize flow ...

But i'm not removing the 280 rad... so you think the 280 rad will be ok with the dual gpu ? Or the 420 for gpus?

I have all the hardware in place, just need to replace the reservoir for one with dual chambers ...
Since the 280 it's the one that's better located for the GPU's ... that was the one i thought to use

Here ( 280 on the bottom, 420 on the top ):


Edited by Pedros - 3/30/11 at 4:30am
post #4 of 8
A dual loop has very little benefits in terms of temperature performance. I suggest to keep it simple and go with a single loop instead. Here is a very good article showing the facts between the two setup and should help you decide which layout is more suitable.
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post #5 of 8
I've run both with my current setup, actually just switched on monday night from dual to single loop. In single loop at idle temps are 2C lower for the cpu while 1C higher for each gpu and at TDP the gpus are 5C cooler and the cpu is 2C hotter. Just up to you which is more important to keep cool. The cpu or gpus. That being said. I would give the cpu the 280 and the gpus the 420
 
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post #6 of 8
Think your 420 might be enough for all and would certainly use the 420 for the GPUs rather than the CPU and MOBO, if you do go dual.
post #7 of 8
I had the same situation.

I myelf have a 1080 rad and 360 for CPU,2xGTX 295 (max overclocked they get really hot)

The major problem people encounter who have bigger formfacter radiators like you and me is the question single or dual loop.

In such a case a dual loop does not make sense because the question "which loop is getting the big rad" will always be a pain.
The best solution for loops with bigger rads is a single loop...using the extreme cooling potential of the bigger rad combined with the smaller ones can conclusively even give you better temps than in the dual loop.

Also will it be much cheaper and easier to manage.
And the flowrate of course especially in your case will be better due to 2 pumps set up in series are going to result in much more power.

I have experienced that running multiple rads in one loop with all your blocks really has its advantages ....the most favourite arguement against a single loop is the heat isolation of the several blocks is ineffective (heat dump) and decreases the overall cooling performance of the loop .
To an extent that statement is not wrong that is why the loop order of a full loop with multiple rads is more relevant than with a single one.
Try to have the water go through the smaller rad first (buffer rad) and than through the bigger one .after that the order of the blocks does not really matter but I like to have the more restrictive blocks at the end and the lesser ones first.
That way the maximum cooling and dissipation potential of both rads is used to its peak and the heat dump of all components can be negated to almost nothing.
Also can this cooling potential be used on all the blocks and not just one or two.
So be sure to lign the block which´s temps matter most to you first and then the rest since flowrate won´t really matter in your case due to your 2 pump setup

I am getting the best temps this way myself:
res->pump->360 rad->1080 rad->Koolance 370->2xEK WB->res
All the theory really shows its benefits in that kind of setup
I first thought that res->pump->360->Koolance 370->1080->2xEK WB would beat the above one tempwise but surprisingly it lost by almost 3 degrees which is really funny to me.
Because of my low restriction blocks I can manage to keep the flow above 1 GPM with my MCP 655 at setting 5 so all good^^
Edited by Kung Pow - 3/30/11 at 9:18am
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post #8 of 8
Thread Starter 
Kung!!! Thanks "mah men! " +rep on that extensive text!

So i'm gonna do

Res > 420 Rad > CPU > Mobo > 280 Rad > GPU 1 > GPU 2 > Res

The second pump will next to the 280 rad ...

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