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Rads in Series or Split + Second Pump Question

post #1 of 10
Thread Starter 
360 > 480 > CPU > GPU > Res > Pump

...or...

480 > CPU > 360 > GPU > Res > Pump

1. I have the rads in series now, would there be a 2C+ benefit to the GPU if the loop were split?

2. How many of you guys are inlining a pump in between rads for redundancy?
Edited by adamlau - 1/3/11 at 2:31am
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post #2 of 10
temps are going to be the same over time if everything is in the same loop.
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post #3 of 10
Laws of thermodynamics tells us that higher dT over the radiators will remove the most heat, provided ambient temp is the same for both rads and air and water flow/surface area is the same. In an ideal system.

1. 2C, I don't know. But the GPU dumps a lot of W (heat) into the system. If the goal is to lower CPU temps a split will be beneficial.

2. Redundancy is nice.
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post #4 of 10
Thread Starter 
If redundancy is the goal, would I place the second pump right after the first, or before the rads?

In the case of rads in series:

360 > 480 > CPU > GPU > Res > Pump > Pump

...or...

360 > Pump > 480 > CPU > GPU > Res > Pump

In the case of split rads:

480 > CPU > 360 > GPU > Res > Pump > Pump

...or...

480 > CPU > Pump > 360 > GPU > Res > Pump
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post #5 of 10
i think you will have too long tubing at this time

480 > CPU > 360 > GPU > Res > Pump > Pump

so i think you must chose this,

360 > 480 > CPU > GPU > Res > Pump > Pump

and i dont think any different ...all have same temp..

but maybe second res will be better for you..like this,

360 > 480 >Res> Pump >CPU > GPU > Res > Pump > ....
    
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post #6 of 10
Thread Starter 
I am going to have over ten feet of tubing in a series setup regardless (I already jerry-rigged my expected setup) as the rads and pump(s) are all external (my case gets up to 40C even with good airflow, NB and SB voltages both bumped up to support my overall OC). Splitting the loop will def take me to fifteen feet and possibly beyond. I figure the additional pressure drop becomes a moot point with an additional pump in the mix. Leaning towards pump > pump in series for the sake of simplicity if 2C+ cannot be had.
Edited by adamlau - 1/3/11 at 5:50am
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post #7 of 10
If redundancy is the goal then placement of the pumps does not really matter as long as they are well fed, since it's a closed loop. Some argue that pumps dump heat into the system and should therefore come after CPU/GPU and before Rad. I think it's pretty negligible. Logistically it may be easier to put the two pumps together. There are some dual pump tops out there. Have you looked at those?

Res, pump, pump, rads into whatever needs lowest temps would be my advice.

I'd not worry about 10 ft of tubing. Gpu and cpu blocks are way more restrictive than tubing anyway. (unless you're planning on using 1/16 inch ID tubing or something ridiculous ^^ )
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post #8 of 10
Loop order does not affect temperatures too much. The difference you are talking about will be less than 0.1C.

A second pump will not improve loop performance but if you do want it for redundancy I suggest buying a dual pump top and putting both pumps directly after one another.

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post #9 of 10
Thread Starter 
I have only taken a cursory glance at dual tops, which of them has been reported to flow best?
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post #10 of 10
I'm using a bitspower dual top. So far its great. Its pretty much the same as the other tops, but I have one more option for top intake if I want to.

Also I was thinking the same about connections, but I decided that it doesn't matter.

Also think about this:
If you you are using this setup:
360 > 480 > CPU > GPU > Res > Pump > Pump
You can add QDCs, for example between the CPU and the rads, and after the GPUs, which means you can take parts out without having to fully drain.

This is also what I am doing.
Res->QDC->pumps->QDC->cpu/motherboard->GPUs->QDC->rads->res.

That way I can take out the pumps if something happens, or the motherboard tray out with everything, without having to fully drain. Will make maintanace much easier when needed to just drain parts of the system.
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