Overclock.net › Forums › Cooling › Air Cooling › GT AP-14's running different speeds
New Posts  All Forums:Forum Nav:

GT AP-14's running different speeds

post #1 of 23
Thread Starter 
I have 5 GT AP-14's installed in my case currently. 1 is pulling on the rear radiator and the other 4 are in push pull with a 240rad in the front.

When I turn all the fans on max they very noticeable and roughly same volume as my old noctua fans. They do move more air though which is why I bought them. My issue however, is that they must spin at slightly different speeds. There is a weird like resonating sound that like goes up and down in pitch and drives me insane. This is noticeable mostly at minimum and maximum speed on my scythe controller. There is random levels for each fan that I can turn them to that sometimes reduces the varying sound pitches. I am about ready to throw these fans out the window I am so annoyed by this sound.

Any suggestions as to why this is happening and is this a common issue with using a bunch of fans? My old Noctuas (all 7 of them) in my old case never seemed to have that issue.
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
post #2 of 23
I *think* I've had that with typhoons, and it's possibly some sort of resonant vibration between the fans at certain/similar rpms that's amplified by the rad - it was a problem for me running multiple fans off the same channel. I eliminated it totally by sticking the fans to the rad with double sided sticky foam (anything that will decouple the fans from the rad and stop vibration).
Not SLi any more
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 @ 4.0 Asus P6TD-Deluxe EVGA GTX770 SC 6GB XMS3 @1530 cas7 
Hard DriveHard DriveHard DriveOptical Drive
Intel X25-M 80GB OCZ Agility 120GB Intel X25-M 40GB LG Blue ROM DVD RW 
CoolingOSMonitorKeyboard
Water cooled w/ T-Balancer BigNG Win 7 x64 Asus PB298Q Cherry 4100L 
PowerCaseMouseMouse Pad
Corsair HX1000 MM UFO-U2 R.A.T. 7 Contagion G.L.I.D.E 9 
AudioAudio
Xonar Essence STX SR80i, DT770 or HT-R518 w/ Monitor Audio BR's 
  hide details  
Reply
Not SLi any more
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 @ 4.0 Asus P6TD-Deluxe EVGA GTX770 SC 6GB XMS3 @1530 cas7 
Hard DriveHard DriveHard DriveOptical Drive
Intel X25-M 80GB OCZ Agility 120GB Intel X25-M 40GB LG Blue ROM DVD RW 
CoolingOSMonitorKeyboard
Water cooled w/ T-Balancer BigNG Win 7 x64 Asus PB298Q Cherry 4100L 
PowerCaseMouseMouse Pad
Corsair HX1000 MM UFO-U2 R.A.T. 7 Contagion G.L.I.D.E 9 
AudioAudio
Xonar Essence STX SR80i, DT770 or HT-R518 w/ Monitor Audio BR's 
  hide details  
Reply
post #3 of 23
Thread Starter 
My Rad runs way hot with the fans low. Do you think sticky taping them would hold even with high heat?
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
post #4 of 23
You could put thicker tape at every contact point, yet still screw them in, which would likely absorb quite a bit of vibration, but some will still get through along the screws. Depending how exactly everything's mounted, industrial strength tape would probably hold. You could also use other materials, like string, as support and wrap all around the rad and fans, though best used in conjunction with double-sided foam-like tape.
post #5 of 23
Thread Starter 
The screws barely fit through the AP-14's as it is. They only turn maybe 2-3 times into the radiator. Anything that made them stick out and it wouldnt catch. Need to find longer than the 30mm screws or w/e those rads came with I guess.

I will also try taking the fans off the Y-adapter and running them in separate channels. Problem is I only have 4 channels for 5 fans :/. I guess I can use the mobo for a fan. When I set them up I had them plugged in to separate channels to test this issue and it was present even with each fan on separate channels. Most of the noise is coming from that 4 fan 240 rad up front and mainly the pulls. The pushes are just lots of air noise when they spin up because they are closest to the front, but the resonating sound is more pronounced from the inner most fans pulling on the radiator.
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
post #6 of 23
Quote:
Originally Posted by Strobe;13942322 
My Rad runs way hot with the fans low. Do you think sticky taping them would hold even with high heat?

I found some pretty strong ones in an auto shop used for sticking number plates to vehicles, about 2mm of foam, stuck anything to anything.
Not SLi any more
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 @ 4.0 Asus P6TD-Deluxe EVGA GTX770 SC 6GB XMS3 @1530 cas7 
Hard DriveHard DriveHard DriveOptical Drive
Intel X25-M 80GB OCZ Agility 120GB Intel X25-M 40GB LG Blue ROM DVD RW 
CoolingOSMonitorKeyboard
Water cooled w/ T-Balancer BigNG Win 7 x64 Asus PB298Q Cherry 4100L 
PowerCaseMouseMouse Pad
Corsair HX1000 MM UFO-U2 R.A.T. 7 Contagion G.L.I.D.E 9 
AudioAudio
Xonar Essence STX SR80i, DT770 or HT-R518 w/ Monitor Audio BR's 
  hide details  
Reply
Not SLi any more
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 @ 4.0 Asus P6TD-Deluxe EVGA GTX770 SC 6GB XMS3 @1530 cas7 
Hard DriveHard DriveHard DriveOptical Drive
Intel X25-M 80GB OCZ Agility 120GB Intel X25-M 40GB LG Blue ROM DVD RW 
CoolingOSMonitorKeyboard
Water cooled w/ T-Balancer BigNG Win 7 x64 Asus PB298Q Cherry 4100L 
PowerCaseMouseMouse Pad
Corsair HX1000 MM UFO-U2 R.A.T. 7 Contagion G.L.I.D.E 9 
AudioAudio
Xonar Essence STX SR80i, DT770 or HT-R518 w/ Monitor Audio BR's 
  hide details  
Reply
post #7 of 23
The fans are ball bearing fans. That adds to the noise.

The fans are not identical. Manufacturing variation, and these were (before dollar devaluation) fifteen-dollar fans, not twenty-dollar fans like the Noctuas. When you add in the ball bearings, cost has to come out somewhere. Since these are industrial fans and close enough is good enough, you won't see them adding cost to make them run at exactly the same speed.

Wolf notes. When the fans spin at certain rates they set up harmonics with their frame.

Only solution I can figure is to put a separate manual fan controller on the line to each fan, and adjust your system until the crazy-making sounds are gone. Then send the gang of controlled fan lines to your controller.

The fans make more noise because they're working against pressure - the resistance of the rads.

Finally: buy squares of Velcro. Cut them diagonally to make triangles. Peel off the sticky protector from one side of each triangle and stick it on a corner of a fan. Repeat until all the fan corners are done. Now for each fan, peel the sticky protectors off the four corners and press the fan down where you want it.

Now your fans will be attached with a vibration-dampening method. When you want to, you can just pull a fan off.
Edited by ehume - 6/20/11 at 9:06pm
alpha updated
(19 items)
 
secundus
(14 items)
 
 
CPUMotherboardGraphicsRAM
i7 4790k Gigabyte GA-Z97X Gaming-7 Intel HD4600 Crucial Ballistix Sport Very Low Profile 8GB Ki... 
Hard DriveCoolingOSMonitor
Samsung 840 EVO 500GB Prolimatech Megahalems Rev. C Windows 8.1 Home Premium 64-bit Acer K242HL 
KeyboardPowerCaseMouse
Dell SK-8110 (PS/2) Seasonic X460 Fanless motherboard tray from CM ATCS 840 Logitech MX 1100 
Mouse PadAudio
Dell Creative SoundBlaster X-Fi MB3 
CPUMotherboardGraphicsRAM
i7 860 Gigabyte GA P55M UD2 ZOTAC/NVidia GTX 650 Ti 2GB 4x4GB G.Skill Ripjaws DDR3-1333 CAS9 
Hard DriveOptical DriveCoolingOS
Samsung 1TB Spinpoint F3 7200.12 Plextor 24x DVD burner Cooler Master Hyper Z600R Win7 64-bit 
MonitorKeyboardPowerCase
Dell E207WFP 20-inch flat panel Logitech Wireless 510 Seasonic X-650 fully modular 80+ Gold Lian Li PC-7FN 
MouseMouse PadAudio
Wireless Mouse WACOM Intuos 3 generic 
  hide details  
Reply
alpha updated
(19 items)
 
secundus
(14 items)
 
 
CPUMotherboardGraphicsRAM
i7 4790k Gigabyte GA-Z97X Gaming-7 Intel HD4600 Crucial Ballistix Sport Very Low Profile 8GB Ki... 
Hard DriveCoolingOSMonitor
Samsung 840 EVO 500GB Prolimatech Megahalems Rev. C Windows 8.1 Home Premium 64-bit Acer K242HL 
KeyboardPowerCaseMouse
Dell SK-8110 (PS/2) Seasonic X460 Fanless motherboard tray from CM ATCS 840 Logitech MX 1100 
Mouse PadAudio
Dell Creative SoundBlaster X-Fi MB3 
CPUMotherboardGraphicsRAM
i7 860 Gigabyte GA P55M UD2 ZOTAC/NVidia GTX 650 Ti 2GB 4x4GB G.Skill Ripjaws DDR3-1333 CAS9 
Hard DriveOptical DriveCoolingOS
Samsung 1TB Spinpoint F3 7200.12 Plextor 24x DVD burner Cooler Master Hyper Z600R Win7 64-bit 
MonitorKeyboardPowerCase
Dell E207WFP 20-inch flat panel Logitech Wireless 510 Seasonic X-650 fully modular 80+ Gold Lian Li PC-7FN 
MouseMouse PadAudio
Wireless Mouse WACOM Intuos 3 generic 
  hide details  
Reply
post #8 of 23
Have you tried running the fans directly connected to the PSU? Perhaps there are only resonance issues at certain voltages (i.e. +11.5 V has noise but +12.0 V does not). Fan controllers may limit the maximum voltage to a fan.
post #9 of 23
Thread Starter 
Quote:
Originally Posted by ehume;13946231 
The fans are ball bearing fans. That adds to the noise.

The fans are not identical. Manufacturing variation, and these were (before dollar devaluation) fifteen-dollar fans, not twenty-dollar fans like the Noctuas. When you add it the ball bearings, cost has to come out somewhere. Since these are industrial fans and close enough is good enough, you won't see them adding cost to make them run at exactly the same speed.

Wolf notes. When the fans spin at certain rates they set up harmonics with their frame.

Only solution I can figure is to put a separate manual fan controller on the line to each fan, and adjust your system until the crazy-making sounds are gone. Then send the gang of controlled fan lines to your controller.

The fans make more noise because they're working against pressure - the resistance of the rads.

Finally: but squares of Velcro. Cut them diagonally to make triangles. Peel off the sticky protector from one side of each triangle and stick it on a corner of a fan. Repeat until all the fan corners are done. Now for each fan, peel the sticky protectors off the four corners and press the fan down where you want it.

Now your fans will be attached with a vibration-dampening method. When you want to, you can just pull a fan off.

Yea I see what you mean. Those Noctuas cost me a pretty penny a year ago. They are louder when I tested them out of case both in hand. At slowest setting and highest speed on my controller the GT's felt to push more air and were quieter. But in case they are way louder than the noctua in my old. I'm about to swap them and see how the noctuas do in this case.

Also, the velcro idea sounds like the best idea ever. /faceplam why didn't I think of that.

Quote:
Originally Posted by Riou;13946285 
Have you tried running the fans directly connected to the PSU? Perhaps there are only resonance issues at certain voltages (i.e. +11.5 V has noise but +12.0 V does not). Fan controllers may limit the maximum voltage to a fan.

Well I don't want them running full speed hardly at all except during benchmarks and maybe extended gaming sessions.

I can keep this computer in a cabinet, with the door shut (has acoustipack inside case and in the cabinet) with just the rear panel cut out of the cabinet and not get too hot with slowest fan speeds on the controller. I get loads of about 65C that way on the CPU and 52 on the GPU with this new liquid setup. Open the door, crank the fans, easy 50-52C load on CPU and GPU roughly the same. I am not OCing though. In fact, the CPU is undervolted to 1.0V
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
post #10 of 23
Thread Starter 
23.JPG

There is the finished rig so you guys can get an idea of what it looks like and fan placement.
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7-6700K @ 4.5GHz Asus Z170-Pro GTX 680 4GB 16GB (2x8GB) 
Hard DriveOSMonitorKeyboard
256GB Samsung 840 Pro Windows 10 Pro 3x Dell U2412M Logitech Illuminated 
PowerCaseMouseMouse Pad
EVGA 850W G2 Fractal Define S G500 Everglide Titan 
AudioOtherOtherOther
Klipsch ProMedia 2.1 EK XE360 Radiator EK-XRES 100 Revo D5 PWM 6x Fractal Venturi HP 120mm, 1x Fractal Venturi... 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › GT AP-14's running different speeds