Single loop vs Dual loop

[ChrisR83]

So here is my question, i will be adding a second GPU to my build. Would it be better to run a single loop with the setup;

Option 1: Reservoir > Pump > GPU's > 360 Radiator > CPU > 240 Radiator > Reservoir.
Option 2: Reservoir > Pump > 240 Radiator > GPU's > 360 Radiator > CPU > Reservoir.

Or is it better to have dual loops?
Loop 1: Reservoir > Pump > GPU's > 360 Radiator > Reservoir.
Loop 2: Reservoir > Pump > CPU > 240 Radiator > Reservoir.

Right now i just have a single loop;

Reservoir > Pump > GPU > CPU > 360 Radiator > Reservoir.

I have not purchased any other components so i am open for suggestions.

 

[Spectre694]

We need to know the what CPU's/GPU's and pump you have now and what your planning.

 

[ChrisR83]

We need to know the what CPU's/GPU's and pump you have now and what your planning.

I have a I7 5820K Overclocked to 4.5. Long story short I returned my Titan X and will be installing two 980Ti's. I will use one or two of these EK-D5 Vario XRES 140, depending on what setup i decide to use.

Link for the pump: http://www.performance-pcs.com/ek-xres-140-d5-vario-incl-pump.html#You-May-Also-Be-Interested

 

[faalin]

If you run a single loop you want the water to go over the cpu first since its the hottest part in the loop then over the gpus.

For dual loops I would run a 240 on the two gpus and the 360 on the cpu. you will see cooler temps on the gpus using the dual loop then you would with a single loop.

 

[ChrisR83]

If you run a single loop you want the water to go over the cpu first since its the hottest part in the loop then over the gpus.

For dual loops I would run a 240 on the two gpus and the 360 on the cpu. you will see cooler temps on the gpus using the dual loop then you would with a single loop.

I would have thought it would be better to have the bigger Radiator on the GPU's in a dual loop configuration. I will keep that in mind if i do go with a dual loop.

What sequence would you set up for the flow if i was to stick with one loop?
Res > Pump > 240 Rad > CPU > 360 Rad > GPU's > Res?
or
Res > Pump > CPU > 360 Rad > GPU's > 240 Rad > Res?

 

[faalin]

It really depends on what case you have for your setup. In theory once you've been gaming for an hour or so your temps will stabilize. Mine was always 24-25*c in the res and after gaming for a few hours would be right around 32*c in the res.

I always ran res> pump> rad> cpu> rad> gpu's> res, your never going to get the water temp below room temp no matter what, but with this setup your cooling off the water before it get to both heat sources.

 

[y2kmedman]

Faalin has the best answer for a single loop in series. Double loop just seperates
the CPU cooling from the GPU there are pros and cons to both. If you really want
your mind blown look into parallel vs series set ups...