PWM fan

nora.e · May 21, 2008

trying to figure out what the deal is with them. how are they different from a "normal" fans and why 4 wires?

hat · May 21, 2008

the 4th wire is a sensor that tells how fast the fan is to spin based on temps... that what PWM is

dark2099 · May 21, 2008

I believe they allow for the motherboard to control the fan speed, increasing it as the temps get high, its for better power usage and noise control. A standard 3 wire fan only operates at one speed unless controlled by some sort of controller.

Edit: beaten by hat

JC316 · May 21, 2008

It can be disabled in the BIOS, but it's exactly what they said it is.

hat · May 21, 2008

hat said:
the 4th wire is a sensor that tells how fast the fan is to spin based on temps... that what PWM is

Just reposting this cause it says this thread has 0 replies... sorry if this is a duplicate post

wow something is messed up I couldn't see those two replies below mine...

smig · May 22, 2008

I have funs with 3 wires only and it's possible to control the speed. :confused:

jbunch07 · May 22, 2008

i cant ever trust the sensors on pwm mode if i can i try to manually control the fan speed.

DrPepper · May 22, 2008

smig said:
I have funs with 3 wires only and it's possible to control the speed.

Yes with a fan controller it controls the voltage supplied to the fan and less voltage means the fan spins slower and vice versa me thinks

my asus one just broke :laugh:

hat · May 22, 2008

I run my PWM fan full blast anyway. I didn't buy it for PWM... it just happened to have it.

Processor	Core 2 Duo E8400
Motherboard	Asus P5G41C-M
Cooling	Stock
Memory	4gig (2 x 2048) Corsair XMS3 DDR3-1600
Video Card(s)	Palit GTS 250
Storage	Seagate Barracuda 320 gig SATA X2
Display(s)	Asus VW222U 22" LCD
Case	Rosewill R101-P-BK
Audio Device(s)	Onboard
Power Supply	CORSAIR CMPSU-550VX 550W
Software	Windows XP Pro 32 bit

System Name	Starlifter :: Dragonfly
Processor	i7 2600k 4.4GHz :: i5 10400
Motherboard	ASUS P8P67 Pro :: ASUS Prime H570-Plus
Cooling	Cryorig M9 :: Stock
Memory	4x4GB DDR3 2133 :: 2x8GB DDR4 2400
Video Card(s)	PNY GTX1070 :: Integrated UHD 630
Storage	Crucial MX500 1TB, 2x1TB Seagate RAID 0 :: Mushkin Enhanced 60GB SSD, 3x4TB Seagate HDD RAID5
Display(s)	Onn 165hz 1080p :: Acer 1080p
Case	Antec SOHO 1030B :: Old White Full Tower
Audio Device(s)	Creative X-Fi Titanium Fatal1ty Pro - Bose Companion 2 Series III :: None
Power Supply	FSP Hydro GE 550w :: EVGA Supernova 550
Software	Windows 10 Pro - Plex Server on Dragonfly
Benchmark Scores	>9000

System Name	Everchanging
Processor	AMD Ryzen 9 5900X
Motherboard	ASUS ROG Crosshair Dark Hero
Cooling	Arctic Cooling Liquid Freezer 2 420mm
Memory	2x16GB Corsair DDR4 3600 CL16
Video Card(s)	eVGA RTX 3090 Ti FTW3
Storage	Samsung 980 Pro 256GB, Samsung 980 Pro 2TB
Display(s)	2xSamsung 28" 4k HDR 144Hz
Case	Fractal Meshify 2 XL
Audio Device(s)	fiio K9 to Hifiman Sundara's via 4.4mm balanced cable
Power Supply	Seasonic Prime TX 850w
Mouse	Corsair Harpoon Wireless RGB
Keyboard	Corsair K70 RGB PRO
Software	Windows 11 x64

System Name	Budget Gaming
Processor	AMD FX6300
Motherboard	Gigabyte 880GMA-USB3
Cooling	Coolermaster Hyper 212+
Memory	8GB Ripjaws DDR3 1600
Video Card(s)	HD7850 1GB
Storage	1TB Sata2
Display(s)	Acer 24" LED
Case	Generic black
Audio Device(s)	Stock onboard
Power Supply	FSP Aurum Gold 650W
Software	Windows 7 Home Premium 64bit

System Name	Starlifter :: Dragonfly
Processor	i7 2600k 4.4GHz :: i5 10400
Motherboard	ASUS P8P67 Pro :: ASUS Prime H570-Plus
Cooling	Cryorig M9 :: Stock
Memory	4x4GB DDR3 2133 :: 2x8GB DDR4 2400
Video Card(s)	PNY GTX1070 :: Integrated UHD 630
Storage	Crucial MX500 1TB, 2x1TB Seagate RAID 0 :: Mushkin Enhanced 60GB SSD, 3x4TB Seagate HDD RAID5
Display(s)	Onn 165hz 1080p :: Acer 1080p
Case	Antec SOHO 1030B :: Old White Full Tower
Audio Device(s)	Creative X-Fi Titanium Fatal1ty Pro - Bose Companion 2 Series III :: None
Power Supply	FSP Hydro GE 550w :: EVGA Supernova 550
Software	Windows 10 Pro - Plex Server on Dragonfly
Benchmark Scores	>9000

PWM fan

nora.e

New Member

hat

Enthusiast

dark2099

JC316

Knows what makes you tick

hat

Enthusiast

smig

New Member

jbunch07

New Member

DrPepper

The Doctor is in the house

hat

Enthusiast

Processor	i5-2500k
Motherboard	ASRock z68 pro3-m
Cooling	Corsair A70
Memory	Kingston HyperX 8GB 2 x 4GB 1600mhz
Storage	OCZ Agility3 60GB(boot) 2x320GB Raid0(storage)
Display(s)	Samsung 24" 1920x1200
Case	Custom
Power Supply	PC Power and Cooling 750w
Software	Win 7 x64

System Name	Rusky
Processor	Intel Core i7 D0 3.8Ghz
Motherboard	Asus P6T
Cooling	Thermaltake Dark Knight
Memory	12GB Patriot Viper's 1866mhz 9-9-9-24
Video Card(s)	GTX470 1280MB
Storage	OCZ Summit 60GB + Samsung 1TB + Samsung 2TB
Display(s)	Sharp Aquos L32X20E 1920 x 1080
Case	Silverstone Raven RV01
Power Supply	Corsair 650 Watt
Software	Windows 7 x64
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System Name	Smig
Processor	AMD Athlon 64 X2 5600+
Motherboard	MSI K9n6SGM-V
Cooling	Arctic Cooling Alpine 64 + 2 80 case fans
Memory	2gb DDR2-800 5-5-5-15@400MHz
Video Card(s)	Inoision 9600GSO 384mb
Storage	2x Seagate SATA2 250gb - RAID-1
Display(s)	no name 19" LCD
Audio Device(s)	On-board 7.1
Power Supply	Topower 500w
Software	XP Pro SP2