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I need a change in fans!! Please help me decide! - Page 2

post #11 of 31
Quote:
Originally Posted by killeraxemannic View Post

Ok so I just tested my computer with a voltmeter that does SPL... Not sure how accurate it is but it says my PC is 42 DB at 900RPM on the Deltas with the meter sitting a foot in front of it. If I put the Delta's to 1850 RPM's it goes to 55DB and at 2150 they are 58DB. Are the Gentle Typhoon 2150rpm PWM going to be quieter than that at idle and at 1850 and 2150? Dumb question but will the GT 2150's that I am looking at be the same noise level as say the GT 1450's at 900 RPM and 1450RPM?

the typhoons will be MUCH quieter. the motor makes very little noise. you'll mostly just hear the sound of moving air.
strix
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strix
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post #12 of 31
Thread Starter 
Well I went with the gt 2150 pwms. Ordered 5 of them. 2 of them are definitely going to be hooked up pwm to my board for the cpu but what about the other 3? Should I do those pwm as well since I have the pwm controller or should I use them 3 pin and hook them to my fan controller?
post #13 of 31
Quote:
Originally Posted by killeraxemannic View Post

The case also has a 140MM stock corsair exhaust fan that vents out the back... Does that change anything about what you said? Definitely on board with getting 5 of the GT's after watching some videos of the noise they make. Seems much more pleasant than other fans.
With the 3x GT front intakes and 2x GT radiator exhaust I would not even use an exhaust fan.

We want case to have more intake airflow potential than exhaust. airflow potential. I say potential because the case flows exactly the same amount of air in as it flows out. The laws of physics say it has to.l wink.gif Having slightly more intake than exhaust flow potential means the case has slightly higher pressure differential between inside of case and room, so the extra flow leaks out of case to make up the difference. Running a 140mm rear exhaust combined wiht 2x radiator exhaust fans give case more exhaust than intake potential, means slightly lower pressure differential inside of case compared to room, so air leaks into case from room to make up the difference.

Yes,l they make the same noise as others at same rpm. Using 5x GT 2150rpm PWM with a PWM splitter or hub so all are speed controlled the same as radiator fans and none will run at full speed. I would guess even when stress testing they will not reach full speed .. because if radiator keeps CPU at about 60c they will be spinning at about 1600rpm, maybe less. I don't know what the PWM version will idle down to, but the variable voltgae will idle down to below 200rpm.
Quote:
Originally Posted by killeraxemannic View Post

Well I went with the gt 2150 pwms. Ordered 5 of them. 2 of them are definitely going to be hooked up pwm to my board for the cpu but what about the other 3? Should I do those pwm as well since I have the pwm controller or should I use them 3 pin and hook them to my fan controller?
Answered above, PWM hub or splitter that uses PSU power Gelid make a nice cable splitter. Several others, including Swiftech make PWM hubs. Do not go Phanteks PWM hub because it is not a PWM hub. It is a PWM to variable voltage adapter hub.
post #14 of 31
4th topic in "Ways to Better Cooling" is "How to Monitor RPM of Fans on Splitters & Hubs" and related topics.
http://www.overclock.net/t/1491876/ways-to-better-cooling-airflow-cooler-fan-data/0_20#post_22319246
post #15 of 31
Scythe slipstream is a personal favorite of mine. Noisy, but not too noisy, and CFM like a leaf blower.
post #16 of 31
Don't go for high RPM fans if you want a silent system. 2000 PRM or even above is absolutely overpowered in such concerns.
I would also go sure to get some fans with FDBs instead of ball bearings, which tend to be much louder over time.

On the other hand:
Simply stacking static pressure is not always the solution. You also have to consider the FPI and depth of the radiator.
Basically you could also go for an NF-P12 which its a balanced version bewteen F12 (pressure) and S12A (flow).

For the case I would choose some 140mm fans to go sure you get the best efficency.
Fractals Venturi HF are possibly the best AF fans you can currently get.
post #17 of 31
What @Dr Strangelove said.
Just not 140mm front fans. I think he missed the 240mm radiator in front. tongue.gif

Stacking fans with radiator between will improve pressure rating and therefore flow more. Radiator 'straightens' the airflow between the fans. But stacking fans with no 'straightener' between them doesn't work very well. The circular / spinning for off of first fan matches the fin rotation of second fan and give little to no gain. Best is to have 2 fans rotating in different directions.tongue.gif
post #18 of 31
Having a push-pull configuration does essentially only serves a single purpose:
maintaining the air speed.

When fans are pushing though the fins of a radiator the moved air is basically struggling with the form resistance and the friction of the surface. To prevent the air from slowing down in such a case - which of course worsens your temps because the emitted heat is more likely to accumulate within this space - you can add another pull fan to increase respectively reconstruct the lost air speed.
But how effective such a build works does always depend on the depth of the radiator. As for the H100i I would say a single-sided configuration is completely fine in case you are not pushing against another resistance/obstacle...

Again, it is not about stacking pressure.
Pressure is only needed to finally move the air in respect of the fans environment, but originally it does not increase the flow itself.
Edited by Dr Strangelove - 6/19/16 at 5:12am
post #19 of 31
And they're off.....talking about push/pull on a slim rad.....a really inefficient slim rad, at that...... doh.gif

There needs to be a guide for doing that - "Ways To Higher Noise Levels With Extremely No to Extremely Limited Performance Gains".
post #20 of 31
I think it should be named "You can't make a real cooler out of a CLC" AKA "You can't make a silk purse out of a sow's ear". tongue.gif

I was just comparing AP-14 and PH-F120MP on H80 radiator. Similar noise level, ariflow and rpm up to about 800rpm, then PH-F120MP needed more rpm to match. At full speed both have about same performance; AP-14 is 1424rpm, F120MP is 1700rpm.

Phanteks PH-F120MP is very impressive considering how much more expensive AP-14 are.
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