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30mm rad with one fan vs 60mm rad in push-pull at low speeds? - Page 4

post #31 of 45
You have your fans on 7V and you would like to slow them down even more?
That's too easy. Just plug your fans to your 5V wire, that's the red one on a Molex connector.

I can have all my 30 fans hooked up to my 5V wire and that brings them all down to 950 rpm from their 2150 rpm rating. But it's not sure if your fans can actually start on 5V. That depends on the fan brand and model.
Edited by PepeLapiu - 3/5/14 at 9:30am
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post #32 of 45
Here is the cheapest, most simple fan controller you can get, which produces no heat at all. I don't know if the idea will appeal to you or no.

You buy one of these for a mere 2-3$ and install it were you please, front panel if you like.
You use the middle prong as the positive to your fans.
You plug one side prong to your red 5V PSU wire.
You plug the other side prong to your yellow 12V PSU wire.
Now with a simple flick of the switch, you can flip your fans from 12V full speed to 5V half speed
But your fans might, or might not have problem starting on the 5V wire.
If they do, you'll have to switch to 12V every time you power up your PC for a second, before flipping back to 5V.

This little trick produces no heat, and takes no front bay room. And it's dirt cheap!
But it's a manual controlling solution, and you only have access to two speeds..
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post #33 of 45
Thanks. Yes, I have tried them at 5v and they will not run that low
post #34 of 45
Quote:
Originally Posted by PepeLapiu View Post

Here is the cheapest, most simple fan controller you can get, which produces no heat at all. I don't know if the idea will appeal to you or no.

You buy one of these for a mere 2-3$ and install it were you please, front panel if you like.
You use the middle prong as the positive to your fans.
You plug one side prong to your red 5V PSU wire.
You plug the other side prong to your yellow 12V PSU wire.
Now with a simple flick of the switch, you can flip your fans from 12V full speed to 5V half speed
But your fans might, or might not have problem starting on the 5V wire.
If they do, you'll have to switch to 12V every time you power up your PC for a second, before flipping back to 5V.

This little trick produces no heat, and takes no front bay room. And it's dirt cheap!
But it's a manual controlling solution, and you only have access to two speeds..

In this scenario, do you tie all the grounds together? Would you then have to fashion a ground point on the metal chassis? Thanks
post #35 of 45
We are using DC current.
So there is no need to ground anything to.the chass

On the PSU Molex extensions, you have 4 color wires. The black is what you use for ground, or negative. The yellow is 12V, red is 5V, and orange is 3.3V

Typically, the 3.3V wire doesn't carry enough wattage to power a bunch of fans, so forget that one.

Here is how I would do it:
Plug the.yellow and red wires to the two poles of the switch I linked earlier.
Plug your fans red wire to the middle prong of the switch.
Plug you fans black wire to the black PSU wires.
Done.
And I would favor series connection over parallele.

A fan hub like this would work just fine to tie up a bunch of fans together.
Edited by PepeLapiu - 3/16/14 at 7:17am
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post #36 of 45
An other thing to keep in mind.
Not all fans will start on 5V. Some do, some don't.
My AP-45 fans hace no problems on the 5v wire.
But other types of fans might not.
So depending on the fans you use, you might have to booth
up your fans on 12V and flip them to the 5V once they are spinning.
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post #37 of 45
If im not wrong the thicker radiator the better. I noticed a differance switching my 35mm swiftech rad for a 80mm one smile.gif. This leads me to the next question. I currenty use a 240mm, 80mm thick radiator in the bottom of my case, with fans on top that push air thru the radiator. Would I benefit much but putting two fan in the bottom as well so I get a push-pull configuration? I dont know what speed my fans are running at, because I use a "Voltage step-down adapter" and they are also connected to my built in fan speed controller. How ever running them at full speed, I hardly notice any differance in temperature. Can you please explain more so I understand this phenomenon. As far as I know I have reached the limit of cooling because you dont get any better temperature unless you delid the cpu.

See picture for visual aid:

Img_5702.jpg?t=original&k=7be2b621
Edited by PachAz - 3/16/14 at 8:49am
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post #38 of 45
There is a difference in perfprmance between slim and thick rads. But it's such a small difference that you would not be able to notice it.
In fact, at speeds below 1000 rpm, thin rads actually outperform thick ones. So your improved cooling, perceived or real, was likely due to something other than your rad's thickness.

And you could increase your rad's performance by 20-30% when adding push/pull (fans on both sides). The gain is more important on thicker rads like your 80mm one.
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post #39 of 45
Okay thank you, then I will try the push and pull on my setup, specially since you say it gains good performance on thick radiators.
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post #40 of 45
Thick rads, and high fpi rads will benefit the most in push/pull.
Thinner low fpi rads gain too, just not as much.
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