Overclock.net › Forums › Cooling › Air Cooling › Questions about 3 wire case fans
New Posts  All Forums:Forum Nav:

Questions about 3 wire case fans

post #1 of 5
Thread Starter 
I have a Scythe SFF21F fan on my TRUE and it is a 3 wire. It did not dawn on me until recently that it was a three wire. This means I have no control over the fan speed, correct? So is it running at its full speed all the time? That is no problem for me because it is quiet as a mouse. I'm hoping that is because it's a great fan, not because it isn't running at an optimum speed.

Second, can I trust HWMonitor software to read the speed of this fan if it is only a 3 pin? It reads the speed at 1500-1560RPM all the time. Is this accurate? Is this what the fan is supposed to be running at, or should it be running faster? Is there anything I can do aside from getting a fan controller to control this fan? I do not need it to run any slower because like I said, it is very quiet. But if I can get it to run faster I wouldn't mind messing with something to be able to do so.
post #2 of 5
3 wires =
red = +
black = -
yellow (or other) = signal.

so you can control the speed...
Darkness
(20 items)
 
Overkill
(13 items)
 
Project X
(13 items)
 
CPUMotherboardGraphicsGraphics
I5 4690K Asus Sabertooth Z97 Mark 1 USB3.1 MSI HD5870 Twin Frozr III MSI HD5870 Twin Frozr III 
RAMHard DriveHard DriveHard Drive
16 Gb G-Skill Ripjaws 2133Mhz Samsung SSD830 Samsung Spinpoint F3  Samsung SSD840 
CoolingOSMonitorMonitor
Heatkiller 3.0 Windows 10 Pro Acer P241W Acer P246H 
KeyboardPowerCaseMouse
Logitech G15 v2 Be Quiet Dark Power Pro 1200w Silverstone TJ-07BW Roccat Kone XTD 
Mouse PadAudioOtherOther
Roccat Raivo Asus D2X 480mm Swiftech radiator Liang Li D5 Vario pump 
CPUMotherboardGraphicsRAM
Intel E6750 Asus Maximus II Formula HD 6350 4Gb Mushkin Enhanced 1002Mhz 
Hard DriveCoolingOSMonitor
2x WD Caviar Black 500Gb in Raid-0 OCZ Vendetta Windows 8 pro Samsung 40" lcd tv 
KeyboardPowerCaseMouse
Galaxy S3 Thermaltake Toughpower 750w MS-Tech 300 Galaxy S3 
Audio
Through AMD HD6350 
CPUMotherboardGraphicsRAM
Intel D525 Foxconn D52s Intel GMA3150 2Gb Corsair XMS2 800Mhz 
Hard DriveOSPowerCase
Seagate 160Gb SataII Windows 8 Developer Preview Chieftec 350w Xbox360 case 
  hide details  
Reply
Darkness
(20 items)
 
Overkill
(13 items)
 
Project X
(13 items)
 
CPUMotherboardGraphicsGraphics
I5 4690K Asus Sabertooth Z97 Mark 1 USB3.1 MSI HD5870 Twin Frozr III MSI HD5870 Twin Frozr III 
RAMHard DriveHard DriveHard Drive
16 Gb G-Skill Ripjaws 2133Mhz Samsung SSD830 Samsung Spinpoint F3  Samsung SSD840 
CoolingOSMonitorMonitor
Heatkiller 3.0 Windows 10 Pro Acer P241W Acer P246H 
KeyboardPowerCaseMouse
Logitech G15 v2 Be Quiet Dark Power Pro 1200w Silverstone TJ-07BW Roccat Kone XTD 
Mouse PadAudioOtherOther
Roccat Raivo Asus D2X 480mm Swiftech radiator Liang Li D5 Vario pump 
CPUMotherboardGraphicsRAM
Intel E6750 Asus Maximus II Formula HD 6350 4Gb Mushkin Enhanced 1002Mhz 
Hard DriveCoolingOSMonitor
2x WD Caviar Black 500Gb in Raid-0 OCZ Vendetta Windows 8 pro Samsung 40" lcd tv 
KeyboardPowerCaseMouse
Galaxy S3 Thermaltake Toughpower 750w MS-Tech 300 Galaxy S3 
Audio
Through AMD HD6350 
CPUMotherboardGraphicsRAM
Intel D525 Foxconn D52s Intel GMA3150 2Gb Corsair XMS2 800Mhz 
Hard DriveOSPowerCase
Seagate 160Gb SataII Windows 8 Developer Preview Chieftec 350w Xbox360 case 
  hide details  
Reply
post #3 of 5
3-pin fans just aren't as able to spin as slowly as 4-pin PWM fans using the Smart Fan feature on your motherboard. I personally don't really see much of a difference in the two.
 
Server
(3 items)
 
 
CPUGraphicsRAMHard Drive
Intel Core i7-3540M Intel HD Graphics 4000 8GB G.SKILL Ripjaws DDR3 1600 Samsung 840 EVO 250GB SSD 
OSMonitorMouseAudio
Windows 10 Pro x64 14" at 1600x900 Logitech Anywhere Mouse MX FiiO E17 USB DAC amp 
CPUOSCase
i3-540 Debian 8 (Jessie) Cooler Master Elite 341 
  hide details  
Reply
 
Server
(3 items)
 
 
CPUGraphicsRAMHard Drive
Intel Core i7-3540M Intel HD Graphics 4000 8GB G.SKILL Ripjaws DDR3 1600 Samsung 840 EVO 250GB SSD 
OSMonitorMouseAudio
Windows 10 Pro x64 14" at 1600x900 Logitech Anywhere Mouse MX FiiO E17 USB DAC amp 
CPUOSCase
i3-540 Debian 8 (Jessie) Cooler Master Elite 341 
  hide details  
Reply
post #4 of 5
Quote:
Originally Posted by onlycodered View Post
3-pin fans just aren't as able to spin as slowly as 4-pin PWM fans using the Smart Fan feature on your motherboard. I personally don't really see much of a difference in the two.
4-pin PWM also saves a bit of electricity... like a whole .1w!
Once again...
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
PowerCaseMouseMouse Pad
Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
  hide details  
Reply
Once again...
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
PowerCaseMouseMouse Pad
Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
  hide details  
Reply
post #5 of 5
Thread Starter 
Oh, I guess I had it completely wrong then haha. So I have control over the fan speed and the fan speed should read correctly? From my vague memory it seems that the fan speed as read by HWMonitor has not changed a whole lot when I adjust it in the BIOS. I guess I'll have to check that again.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › Questions about 3 wire case fans