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Quick Question: How Many D5 Pumps Do I Need? - Page 4

post #31 of 50
Quote:
Originally Posted by PepeLapiu View Post

Well, resistance is subjective.

I am running 4 GPUs in semi-parallel and a cpu block both connected with quick disconnects, 6 rads, and a plethora of 45 degree and 90 degree fittings...
Edited by Slomo4shO - 3/11/14 at 11:01am
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post #32 of 50
One loop will always cool better than two loops..
There is absolutely no performance gain to dual loops.

You can do it for fun, or for looks. Just don't do 2 loops thinking it will cool better.
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post #33 of 50
Quote:
Originally Posted by PepeLapiu View Post

One loop will always cool better than two loops..

That isn't entirely true
Quote:
Under extreme performance scenarios, and from a pure performance standpoint, dual loops versus single loop are neither better nor worse, under the strict condition that the load ratios are evenly balanced.
Under the most commonly encountered loads though, single loops do win.

Under both of the above use scenarios, single loops also win from a reliability standpoint because of pump redundancy.

The choice is yours to make.
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post #34 of 50
Quote:
Originally Posted by Slomo4shO View Post

That isn't entirely true

I don't know who you quoted but I will explain this.

Let's say you want to encode a vid in dual loops with a 240 in each loop.
So you OC your chip and it gets hot. The fans e cranked up.
Your CPU could really use more raddage, all it has is that 240.
Meanwhile, there is a 240 in your GPU loop which is idle.

So most of the time, there is always one rad maxed out while, the other one is not used to it's full potential.

Now, if you have your rads perfectly balanced for mining, just as an example. That's fine. But your loop is only fully efficient when mining, nothing else.

With a single loop, there are no rad unused. They all go to cool whatever needs cooling, all the time.

Makes sense?

At best, under exact circimstances, a dual loop might be equal to a single loop. But for the rest of the time, there will be lost of efficiency in a dual loop scenario.
Edited by PepeLapiu - 3/11/14 at 10:15pm
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post #35 of 50
Thread Starter 
New build plan:
(Edit - outdated pic)
Not a single rad goes into another, all fresh air to each rad. Air goes in the main chamber, some goes up and out, some goes down and out. The bottom rads blow the air threw the case and out. No heat recycling on the rads with a total of 12x120 rad real estate. 14x120 with no bay reservoirs. Plenty of room for push pull too. I'm pretty proud of this design. The only thing I wish it had was positive pressure to help with dust. However, that is almost impossible with watercooling this many rads.
Edited by Neo Zuko - 3/14/14 at 10:33am
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post #36 of 50
Quote:
Originally Posted by PepeLapiu View Post

Makes sense?

Considering that you just regurgitated the provided link of the analysis by Gabe from SwiftTech...

Here is the writeup with the benchmarks.

The temps of a CPU + SLI/Crossfire setup:


The temps of a CPU + GPU:




Again, it isn't always better to go single loop, it depends on personal needs/useage. Considering that the OP's build only has a single GPU and an abundance of radiators, going with either setup would provide no tangible differences in temperature...

Quote:
Originally Posted by Neo Zuko View Post

New build plan:

The Avatar State OCN .jpg
The only thing I wish it had was positive pressure to help with dust. However, that is almost impossible with watercooling this many rads.
Change the top rad to pull air into the case and set the front three fans to exhaust with the rear also being intake.
Edited by Slomo4shO - 3/12/14 at 10:14am
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post #37 of 50
Thread Starter 
Then the heat goes over the mother board, I thought that was bad? Also I can't use the 240 after all, the AX1500i has a really fat ass lol.
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post #38 of 50
Quote:
Originally Posted by Neo Zuko View Post

Then the heat goes over the mother board, I thought that was bad? Also I can't use the 240 after all, the AX1500i has a really fat ass lol.

I have found, unless you have a VRM block which you do, any air over the board will be beneficial. The air off your rads with those fans is not going to be too much warmer than ambient, after the first handful of 120mm fans, the temperature of water will be close enough to ambient that you will BARELY be adding heat to the air inside the case as when the temps are closer to ambient, it becomes more challenging to remove heat, and becomes less efficient.

Just position your first rad maybe somewhere away from the board if you think it will be an issue.
Edited by Xinoxide - 3/13/14 at 3:06am
post #39 of 50
Just a suggestion to your design.
Rad thickness really doesn't matter all that much at fan sppeds below 1500 rpm.
And with that much raddage, you would be hatd pressed to ever find the need to push your fans faster than that.
So I would consider having only one pedestal with a 360 on each side of it, both pulling in fresh air.
You might have to go with thinner rads to fit them in.
But at low speeds, thin rads sometimes perform BETTER than thick ones
With all case fans exhausting air and your top rad pulling on fresh air.
This way, you'd save on height, and cost of a second pedestal.

You'd get the same raddage as now, and same performance too.
The only drawback is you'd have to use thinner rads in the bottom.
But again, thick rads are only justified at faster speeds.

Look here, below 1000 rpm, the 30mm thick ST30 performs actually better than it's twice as thick big brother UT60:


And at 1500 rpm, the difference between a ST30, and UT60 is so small that you won't ever notice a difference in real life.

But all this assumes your pedestal can vent out into your case.
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post #40 of 50
And a rad blowing directly onto your board won't be an issue at all.
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Dark Vader
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39 X AP-45 2150 rpm Gentle Typhoon fans Lamptron CW611 FrozenQ Dual Bay Reservoir 2x XT45 480. 1x UT60 480 ~ 1x UT60 360 ~ 1x UT... 
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