Overclock.net › Forums › Cooling › Air Cooling › 38mm fan on top of a 25mm fan + fan controller
New Posts  All Forums:Forum Nav:

38mm fan on top of a 25mm fan + fan controller

post #1 of 26
Thread Starter 
Hey, I was wondering if anyone tried putting a 120x38mm fan on top of a 120x25mm fan.

During low CPU work, turn off the 38mm fan and turn on the 25mm fan VIA a fan controller.

During intensive CPU work, turn on the 38mm fan and turn off the 25mm fan VIA a fan controller.

Would this break the 25mm fan or cause it to fail early?

I could care less about how loud the fan is when I'm stress testing and I don't care if idle temperatures are a little higher than normal.
    
CPUMotherboardGraphicsRAM
Intel 2600k (Stock) Asus Maximus Gene V  Powercolor AX6850 Passive Cooler Gskill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
OCZ Vertex II 90GB External Noctua NH-D14 Windows 7 Pro 64bit 
MonitorKeyboardPowerCase
Gone Microsoft Ergonomic 4000 Keyboard Corsair AX850 Silverstone FT03B 
MouseMouse Pad
Logitech G500 Black Normal 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel 2600k (Stock) Asus Maximus Gene V  Powercolor AX6850 Passive Cooler Gskill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
OCZ Vertex II 90GB External Noctua NH-D14 Windows 7 Pro 64bit 
MonitorKeyboardPowerCase
Gone Microsoft Ergonomic 4000 Keyboard Corsair AX850 Silverstone FT03B 
MouseMouse Pad
Logitech G500 Black Normal 
  hide details  
Reply
post #2 of 26
I don't understand why you'd do this instead of buying a quality 38mm fan and a good PWM fan controller so that when you're running your computer everyday you put it in PWM mode (which will give you lower noise), during benching you put it in manual control and crank it up.

Otherwise, to answer your questions in order: Nobody has tried it because they would do what I said in the first part, and no that shouldn't kill the 25 mm fan early, but the 38mm fan would be restricted by the 25mm fan.
Maximum Dwarf
(15 items)
 
Density!
(12 items)
 
 
CPUMotherboardGraphicsRAM
i5-3570k ASUS MAXIMUS IV GENE HD7970 Gen 1 Ripjaws Z 2x8GB 2133MHz 
Hard DriveHard DriveOptical DriveCooling
1TB RE4 2x3TB WD Red LG 10x BD-R Corsair H80i w/push pull 
OSMonitorKeyboardPower
Win 7 Ultimate 3x 1920x1080 LG IPS displays. Razer Mass Effect 3 Blackwidow Ultimate Cooler Master Silent Pro M850 
CaseMouseMouse Pad
Silverstone TJ08B-E R.A.T. 7 An ergonomic one 
CPUMotherboardRAMHard Drive
i7 3770k Gigabyte Sniper M3 1155 mATX CORSAIR Vengeance 8GB (2 x 4GB) 1600MHz 1TB WD RE4 
Hard DriveHard DriveHard DriveHard Drive
2TB WD Red 2TB WD Red 4TB WD Red 4TB WD Red 
PowerCaseAudioOther
750W Seasonic Gold Fractal Node 804 5.1 Definitive Def Tech PERC 5i RAID card w/ BBU (LSI Firmware) 
  hide details  
Reply
Maximum Dwarf
(15 items)
 
Density!
(12 items)
 
 
CPUMotherboardGraphicsRAM
i5-3570k ASUS MAXIMUS IV GENE HD7970 Gen 1 Ripjaws Z 2x8GB 2133MHz 
Hard DriveHard DriveOptical DriveCooling
1TB RE4 2x3TB WD Red LG 10x BD-R Corsair H80i w/push pull 
OSMonitorKeyboardPower
Win 7 Ultimate 3x 1920x1080 LG IPS displays. Razer Mass Effect 3 Blackwidow Ultimate Cooler Master Silent Pro M850 
CaseMouseMouse Pad
Silverstone TJ08B-E R.A.T. 7 An ergonomic one 
CPUMotherboardRAMHard Drive
i7 3770k Gigabyte Sniper M3 1155 mATX CORSAIR Vengeance 8GB (2 x 4GB) 1600MHz 1TB WD RE4 
Hard DriveHard DriveHard DriveHard Drive
2TB WD Red 2TB WD Red 4TB WD Red 4TB WD Red 
PowerCaseAudioOther
750W Seasonic Gold Fractal Node 804 5.1 Definitive Def Tech PERC 5i RAID card w/ BBU (LSI Firmware) 
  hide details  
Reply
post #3 of 26
Just use one good fan on a controller as CTRL advised. With your idea one fan would be doing nothing but hindering airflow at any time, and the benefit, if any, would be minimal.
post #4 of 26
this idea doesn't make much sense, why wouldn't you just get a good high cfm fan and just a good controller?
   
Spare Rigs
(13 items)
 
CPUMotherboardGraphicsRAM
core 2 duo P8700@2.53GHz 2242CTO Intel X4500MHD 4gb 
Hard DriveOptical DriveOSMonitor
fujitsu 320gb dvd rom cd/rw Windows 7 Professional x64 15.4" 
PowerCaseMouse
Panasonic 6-cell + 65W AC adapter lenovo t500 Logitech MX518 
CPUMotherboardGraphicsRAM
Intel i5 760 evga p55 sli MSI gtx460 Hawk corsair dominator 
Hard DriveCoolingOSMonitor
kingston ssdnow hyper 212+ windows 7 professional sam syncmaster 
MonitorKeyboardPowerCase
Acer Razer Blackwidow ocz 650W coolermaster elite 335 
Mouse
Logitech MX518 
  hide details  
Reply
   
Spare Rigs
(13 items)
 
CPUMotherboardGraphicsRAM
core 2 duo P8700@2.53GHz 2242CTO Intel X4500MHD 4gb 
Hard DriveOptical DriveOSMonitor
fujitsu 320gb dvd rom cd/rw Windows 7 Professional x64 15.4" 
PowerCaseMouse
Panasonic 6-cell + 65W AC adapter lenovo t500 Logitech MX518 
CPUMotherboardGraphicsRAM
Intel i5 760 evga p55 sli MSI gtx460 Hawk corsair dominator 
Hard DriveCoolingOSMonitor
kingston ssdnow hyper 212+ windows 7 professional sam syncmaster 
MonitorKeyboardPowerCase
Acer Razer Blackwidow ocz 650W coolermaster elite 335 
Mouse
Logitech MX518 
  hide details  
Reply
post #5 of 26
Thread Starter 
Quote:
Originally Posted by CTRLurself [Knyte Custom] View Post
I don't understand why you'd do this instead of buying a quality 38mm fan and a good PWM fan controller so that when you're running your computer everyday you put it in PWM mode (which will give you lower noise), during benching you put it in manual control and crank it up.

Otherwise, to answer your questions in order: Nobody has tried it because they would do what I said in the first part, and no that shouldn't kill the 25 mm fan early, but the 38mm fan would be restricted by the 25mm fan.
Quote:
Originally Posted by t-ramp View Post
Just use one good fan on a controller as CTRL advised. With your idea one fan would be doing nothing but hindering airflow at any time, and the benefit, if any, would be minimal.
Quote:
Originally Posted by chinesethunda View Post
this idea doesn't make much sense, why wouldn't you just get a good high cfm fan and just a good controller?
The 38mm fans I've used in the past have an whining sound or a clicking noise when the fan is slowed down. They also couldn't be slowed down to the point where I liked their performance/noise ratio.

I'm using a Lamptron FC4, which is a decent controller.
    
CPUMotherboardGraphicsRAM
Intel 2600k (Stock) Asus Maximus Gene V  Powercolor AX6850 Passive Cooler Gskill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
OCZ Vertex II 90GB External Noctua NH-D14 Windows 7 Pro 64bit 
MonitorKeyboardPowerCase
Gone Microsoft Ergonomic 4000 Keyboard Corsair AX850 Silverstone FT03B 
MouseMouse Pad
Logitech G500 Black Normal 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel 2600k (Stock) Asus Maximus Gene V  Powercolor AX6850 Passive Cooler Gskill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
OCZ Vertex II 90GB External Noctua NH-D14 Windows 7 Pro 64bit 
MonitorKeyboardPowerCase
Gone Microsoft Ergonomic 4000 Keyboard Corsair AX850 Silverstone FT03B 
MouseMouse Pad
Logitech G500 Black Normal 
  hide details  
Reply
post #6 of 26
Quote:
Originally Posted by listen to remix View Post
The 38mm fans I've used in the past have an whining sound or a clicking noise when the fan is slowed down. They also couldn't be slowed down to the point where I liked their performance/noise ratio.

I'm using a Lamptron FC4, which is a decent controller.
mount your HSF to blow air bottom-> top, mount the 38mm fan to the bottom of the HSF blowing air up. If your fan clicks ever again you have something in the bearings.

And the key part of what I said was a good PWM fan controller which means that in PWM mode your motherboard controls the fan automatically, and in manual mode your knob controls it. Something like: http://www.newegg.com/Product/Produc...82E16811995075
Maximum Dwarf
(15 items)
 
Density!
(12 items)
 
 
CPUMotherboardGraphicsRAM
i5-3570k ASUS MAXIMUS IV GENE HD7970 Gen 1 Ripjaws Z 2x8GB 2133MHz 
Hard DriveHard DriveOptical DriveCooling
1TB RE4 2x3TB WD Red LG 10x BD-R Corsair H80i w/push pull 
OSMonitorKeyboardPower
Win 7 Ultimate 3x 1920x1080 LG IPS displays. Razer Mass Effect 3 Blackwidow Ultimate Cooler Master Silent Pro M850 
CaseMouseMouse Pad
Silverstone TJ08B-E R.A.T. 7 An ergonomic one 
CPUMotherboardRAMHard Drive
i7 3770k Gigabyte Sniper M3 1155 mATX CORSAIR Vengeance 8GB (2 x 4GB) 1600MHz 1TB WD RE4 
Hard DriveHard DriveHard DriveHard Drive
2TB WD Red 2TB WD Red 4TB WD Red 4TB WD Red 
PowerCaseAudioOther
750W Seasonic Gold Fractal Node 804 5.1 Definitive Def Tech PERC 5i RAID card w/ BBU (LSI Firmware) 
  hide details  
Reply
Maximum Dwarf
(15 items)
 
Density!
(12 items)
 
 
CPUMotherboardGraphicsRAM
i5-3570k ASUS MAXIMUS IV GENE HD7970 Gen 1 Ripjaws Z 2x8GB 2133MHz 
Hard DriveHard DriveOptical DriveCooling
1TB RE4 2x3TB WD Red LG 10x BD-R Corsair H80i w/push pull 
OSMonitorKeyboardPower
Win 7 Ultimate 3x 1920x1080 LG IPS displays. Razer Mass Effect 3 Blackwidow Ultimate Cooler Master Silent Pro M850 
CaseMouseMouse Pad
Silverstone TJ08B-E R.A.T. 7 An ergonomic one 
CPUMotherboardRAMHard Drive
i7 3770k Gigabyte Sniper M3 1155 mATX CORSAIR Vengeance 8GB (2 x 4GB) 1600MHz 1TB WD RE4 
Hard DriveHard DriveHard DriveHard Drive
2TB WD Red 2TB WD Red 4TB WD Red 4TB WD Red 
PowerCaseAudioOther
750W Seasonic Gold Fractal Node 804 5.1 Definitive Def Tech PERC 5i RAID card w/ BBU (LSI Firmware) 
  hide details  
Reply
post #7 of 26
if the fans click when its a lower rpm then you need better fans that can handle the lower voltages
   
Spare Rigs
(13 items)
 
CPUMotherboardGraphicsRAM
core 2 duo P8700@2.53GHz 2242CTO Intel X4500MHD 4gb 
Hard DriveOptical DriveOSMonitor
fujitsu 320gb dvd rom cd/rw Windows 7 Professional x64 15.4" 
PowerCaseMouse
Panasonic 6-cell + 65W AC adapter lenovo t500 Logitech MX518 
CPUMotherboardGraphicsRAM
Intel i5 760 evga p55 sli MSI gtx460 Hawk corsair dominator 
Hard DriveCoolingOSMonitor
kingston ssdnow hyper 212+ windows 7 professional sam syncmaster 
MonitorKeyboardPowerCase
Acer Razer Blackwidow ocz 650W coolermaster elite 335 
Mouse
Logitech MX518 
  hide details  
Reply
   
Spare Rigs
(13 items)
 
CPUMotherboardGraphicsRAM
core 2 duo P8700@2.53GHz 2242CTO Intel X4500MHD 4gb 
Hard DriveOptical DriveOSMonitor
fujitsu 320gb dvd rom cd/rw Windows 7 Professional x64 15.4" 
PowerCaseMouse
Panasonic 6-cell + 65W AC adapter lenovo t500 Logitech MX518 
CPUMotherboardGraphicsRAM
Intel i5 760 evga p55 sli MSI gtx460 Hawk corsair dominator 
Hard DriveCoolingOSMonitor
kingston ssdnow hyper 212+ windows 7 professional sam syncmaster 
MonitorKeyboardPowerCase
Acer Razer Blackwidow ocz 650W coolermaster elite 335 
Mouse
Logitech MX518 
  hide details  
Reply
post #8 of 26
Quote:
Originally Posted by chinesethunda View Post
if the fans click when its a lower rpm then you need better fans that can handle the lower voltages
I was saying "make the fan hang suspended" to get around having to buy a nicer fan. I have never had/seen a fan click when it is suspended without it being dirty.
Maximum Dwarf
(15 items)
 
Density!
(12 items)
 
 
CPUMotherboardGraphicsRAM
i5-3570k ASUS MAXIMUS IV GENE HD7970 Gen 1 Ripjaws Z 2x8GB 2133MHz 
Hard DriveHard DriveOptical DriveCooling
1TB RE4 2x3TB WD Red LG 10x BD-R Corsair H80i w/push pull 
OSMonitorKeyboardPower
Win 7 Ultimate 3x 1920x1080 LG IPS displays. Razer Mass Effect 3 Blackwidow Ultimate Cooler Master Silent Pro M850 
CaseMouseMouse Pad
Silverstone TJ08B-E R.A.T. 7 An ergonomic one 
CPUMotherboardRAMHard Drive
i7 3770k Gigabyte Sniper M3 1155 mATX CORSAIR Vengeance 8GB (2 x 4GB) 1600MHz 1TB WD RE4 
Hard DriveHard DriveHard DriveHard Drive
2TB WD Red 2TB WD Red 4TB WD Red 4TB WD Red 
PowerCaseAudioOther
750W Seasonic Gold Fractal Node 804 5.1 Definitive Def Tech PERC 5i RAID card w/ BBU (LSI Firmware) 
  hide details  
Reply
Maximum Dwarf
(15 items)
 
Density!
(12 items)
 
 
CPUMotherboardGraphicsRAM
i5-3570k ASUS MAXIMUS IV GENE HD7970 Gen 1 Ripjaws Z 2x8GB 2133MHz 
Hard DriveHard DriveOptical DriveCooling
1TB RE4 2x3TB WD Red LG 10x BD-R Corsair H80i w/push pull 
OSMonitorKeyboardPower
Win 7 Ultimate 3x 1920x1080 LG IPS displays. Razer Mass Effect 3 Blackwidow Ultimate Cooler Master Silent Pro M850 
CaseMouseMouse Pad
Silverstone TJ08B-E R.A.T. 7 An ergonomic one 
CPUMotherboardRAMHard Drive
i7 3770k Gigabyte Sniper M3 1155 mATX CORSAIR Vengeance 8GB (2 x 4GB) 1600MHz 1TB WD RE4 
Hard DriveHard DriveHard DriveHard Drive
2TB WD Red 2TB WD Red 4TB WD Red 4TB WD Red 
PowerCaseAudioOther
750W Seasonic Gold Fractal Node 804 5.1 Definitive Def Tech PERC 5i RAID card w/ BBU (LSI Firmware) 
  hide details  
Reply
post #9 of 26
well i mean some fans click when they don't have enough voltage, so idk if thats the case or not
   
Spare Rigs
(13 items)
 
CPUMotherboardGraphicsRAM
core 2 duo P8700@2.53GHz 2242CTO Intel X4500MHD 4gb 
Hard DriveOptical DriveOSMonitor
fujitsu 320gb dvd rom cd/rw Windows 7 Professional x64 15.4" 
PowerCaseMouse
Panasonic 6-cell + 65W AC adapter lenovo t500 Logitech MX518 
CPUMotherboardGraphicsRAM
Intel i5 760 evga p55 sli MSI gtx460 Hawk corsair dominator 
Hard DriveCoolingOSMonitor
kingston ssdnow hyper 212+ windows 7 professional sam syncmaster 
MonitorKeyboardPowerCase
Acer Razer Blackwidow ocz 650W coolermaster elite 335 
Mouse
Logitech MX518 
  hide details  
Reply
   
Spare Rigs
(13 items)
 
CPUMotherboardGraphicsRAM
core 2 duo P8700@2.53GHz 2242CTO Intel X4500MHD 4gb 
Hard DriveOptical DriveOSMonitor
fujitsu 320gb dvd rom cd/rw Windows 7 Professional x64 15.4" 
PowerCaseMouse
Panasonic 6-cell + 65W AC adapter lenovo t500 Logitech MX518 
CPUMotherboardGraphicsRAM
Intel i5 760 evga p55 sli MSI gtx460 Hawk corsair dominator 
Hard DriveCoolingOSMonitor
kingston ssdnow hyper 212+ windows 7 professional sam syncmaster 
MonitorKeyboardPowerCase
Acer Razer Blackwidow ocz 650W coolermaster elite 335 
Mouse
Logitech MX518 
  hide details  
Reply
post #10 of 26
Quote:
Originally Posted by listen to remix View Post
The 38mm fans I've used in the past have an whining sound or a clicking noise when the fan is slowed down. They also couldn't be slowed down to the point where I liked their performance/noise ratio.

I'm using a Lamptron FC4, which is a decent controller.
To answer this question look at Chinesethunda's below post's.

Quote:
Originally Posted by chinesethunda View Post
if the fans click when its a lower rpm then you need better fans that can handle the lower voltages
Quote:
Originally Posted by chinesethunda View Post
well i mean some fans click when they don't have enough voltage, so idk if thats the case or not
If your looking for the "Jesus" of 38mm fans look no further than this bad boy

Only cheap fans will click when undervolting. I use 2 of the above linked fan's on my Silver Arrow. I also Use Rheosmart to undervolt them. Never once have I hread a click,growl,howl,hiss,chirp, beep or any other odd noise from them and they have ran 24/7 undervolted from almost 8mo now. The controller is a hoss at handling uber powerd fans. Durring testing I ran both San Ace 1011's +7 120mm 70+CFM fans off ONE CHANNEL(all fans at 100% power). I did this for like almost a week befor deciding to call this controller "Hoss". In my rig I almost never run my San Ace's at 100% becouse that's just plain silly. I keep them at around 80-ish and have amazing cooling on my chip. I hope this helps. and dont buy Kaze ultra, they suck.
Also, why a 38mm fan if I may ask. In a perfect world you would use AP-29's or AP-30's. If you realy want to go nucking futs with wind power AP-31's.

38mm fans provide high static pressure, this works best when paired with a water cooling rad, for an Air cooler 25mm's are fine. Hope this helps out some cheer's!
Edited by KhaoticKomputing - 8/18/11 at 5:33am
Gizmoto
(18 items)
 
They beat me:(
(15 items)
 
Home Server V1.0
(17 items)
 
CPUMotherboardGraphicsRAM
AMD Phenom II x6 1040t @2.7Ghz ASRock 880GM-LE FX  AMD Radeon HD 4250 integrated graphics Micro Center(ADATA) 8Gb (2x4) 1333 
Hard DriveHard DriveHard DriveHard Drive
Western Digital Caviar Blue 640Gb Samsung SpinPoint F4 2Tb Seagate Barracuda 7200.9 ST3500641AS-RK 500Gb Seagate Barracuda 7200.9 ST3500641AS-RK 500Gb 
Optical DriveOptical DriveCoolingOS
ASUS 24X DVD Burner ASUS 24X DVD Burner Stock AMD Cooler Windows 7 Home Premium 64 bit 
OSOSPowerCase
Linux Mint (VM) Linux Ubuntu (VM) Inland ILG-500R2 500w PSU DiabloTek Evo Mid-tower Case 
Other
Inland IL internal card reader 
  hide details  
Reply
Gizmoto
(18 items)
 
They beat me:(
(15 items)
 
Home Server V1.0
(17 items)
 
CPUMotherboardGraphicsRAM
AMD Phenom II x6 1040t @2.7Ghz ASRock 880GM-LE FX  AMD Radeon HD 4250 integrated graphics Micro Center(ADATA) 8Gb (2x4) 1333 
Hard DriveHard DriveHard DriveHard Drive
Western Digital Caviar Blue 640Gb Samsung SpinPoint F4 2Tb Seagate Barracuda 7200.9 ST3500641AS-RK 500Gb Seagate Barracuda 7200.9 ST3500641AS-RK 500Gb 
Optical DriveOptical DriveCoolingOS
ASUS 24X DVD Burner ASUS 24X DVD Burner Stock AMD Cooler Windows 7 Home Premium 64 bit 
OSOSPowerCase
Linux Mint (VM) Linux Ubuntu (VM) Inland ILG-500R2 500w PSU DiabloTek Evo Mid-tower Case 
Other
Inland IL internal card reader 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › 38mm fan on top of a 25mm fan + fan controller