• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Explained: ASUS Q-fan function

de.das.dude

Pro Indian Modder
Joined
Jun 13, 2010
Messages
9,022 (1.71/day)
Location
Internet is borked, please help.
System Name Monke | Work Thinkpad| J1nnx took Old Monke
Processor Ryzen 5600X | Ryzen 5500U | FX8320
Motherboard ASRock B550 Extreme4 | ? | Asrock 990FX Extreme 4
Cooling 240mm Rad | Not needed | hyper 212 EVO
Memory 2x16GB DDR4 3600 Corsair RGB | 16 GB DDR4 3600 | 16GB DDR3 1600
Video Card(s) Sapphire Pulse RX6700XT 12GB | Vega 8 | Sapphire Pulse RX580 8GB
Storage Samsung 980 nvme (Primary) | some samsung SSD
Display(s) Dell 2723DS | Some 14" 1080p 98%sRGB IPS | Dell 2240L
Case Ant Esports Tempered case | Thinkpad | Antec
Audio Device(s) Logitech Z333 | Jabra corpo stuff
Power Supply Corsair RM750e | not needed | Corsair GS 600
Mouse Logitech G400 | nipple
Keyboard Logitech G213 | stock kb is awesome | Logitech K230
VR HMD ;_;
Software Windows 10 Professional x3
Benchmark Scores There are no marks on my bench
Well, this will be a lame thread i know. But my mobo manual didint quite explain the q-fan function properly. Internet failed me, so i tried tweaking and now have enough knowledge of this subject and thought i should share.



This Q-fan function is found on most new mobos from ASUS.
This basically controls the speed of the CPU fan at different temps. more like how it should behave.


the first option is to enable or disable it.
enabling this uncovers 3 more options,

the start voltage,
start temp and the temp at which fan speed should be max.


The Start Voltage.
this is the voltage which will be applied to the PWM wire of the fan till the required "start temp" is achieved by the CPU.
If you want quiet running(the main reason for enabling this function). you should set this at 4V, the lowest available.

The Start Speed Temp
This the temp from which there will be a linear increase in the CPU fan's RPM till the max RPM temp is hit. For quiet running, set this to the highest possible. i like to keep it at 40C though.


The Max Speed temp.
This is the temp where the fan will hit max RPM, and hopefully not, if the CPU temp still increases, the fan will maintain constant high speed.



For max cooling i encourage you to disable this function as the default mode seemed to do a better job for me(tested on my current setup, see specs)



:rockout:

thanks for the thanks :respect:
 
Joined
Feb 24, 2009
Messages
3,516 (0.61/day)
System Name Money Hole
Processor Core i7 970
Motherboard Asus P6T6 WS Revolution
Cooling Noctua UH-D14
Memory 2133Mhz 12GB (3x4GB) Mushkin 998991
Video Card(s) Sapphire Tri-X OC R9 290X
Storage Samsung 1TB 850 Evo
Display(s) 3x Acer KG240A 144hz
Case CM HAF 932
Audio Device(s) ADI (onboard)
Power Supply Enermax Revolution 85+ 1050w
Mouse Logitech G602
Keyboard Logitech G710+
Software Windows 10 Professional x64
Yea Asus changed them to be more tweakable and useable when the P55 came out. On the AMD side I'm not sure when it was but seeing as de.das.dude is using a 785G board I would guess then as I don't think any of the other 700 series Asus AMD boards received anything but the older way of Q-Fan.
 

de.das.dude

Pro Indian Modder
Joined
Jun 13, 2010
Messages
9,022 (1.71/day)
Location
Internet is borked, please help.
System Name Monke | Work Thinkpad| J1nnx took Old Monke
Processor Ryzen 5600X | Ryzen 5500U | FX8320
Motherboard ASRock B550 Extreme4 | ? | Asrock 990FX Extreme 4
Cooling 240mm Rad | Not needed | hyper 212 EVO
Memory 2x16GB DDR4 3600 Corsair RGB | 16 GB DDR4 3600 | 16GB DDR3 1600
Video Card(s) Sapphire Pulse RX6700XT 12GB | Vega 8 | Sapphire Pulse RX580 8GB
Storage Samsung 980 nvme (Primary) | some samsung SSD
Display(s) Dell 2723DS | Some 14" 1080p 98%sRGB IPS | Dell 2240L
Case Ant Esports Tempered case | Thinkpad | Antec
Audio Device(s) Logitech Z333 | Jabra corpo stuff
Power Supply Corsair RM750e | not needed | Corsair GS 600
Mouse Logitech G400 | nipple
Keyboard Logitech G213 | stock kb is awesome | Logitech K230
VR HMD ;_;
Software Windows 10 Professional x3
Benchmark Scores There are no marks on my bench
well my mobo is 4monhs old. so i guess they didnt change in all the places.
 

AsRock

TPU addict
Joined
Jun 23, 2007
Messages
19,069 (3.00/day)
Location
UK\USA
Q fan pisses me off it's some thing they should of perfected by now. Like i can set the CPU fan to a nice silent speed and when it gets hotter it goes faster but once it's cooled down it stays at high speed.

I been hoping Zalman get their thumbs out of their butts and perfect the ZM-MFC2 already. Like for example when using 3 pin fans you could use the heat sensors to control the fan speeds.

So for each fan would have 2-3 different speeds depending on what the sensor picked up.


Maybe one day they will do it right LMAO.
 
Joined
Feb 24, 2009
Messages
3,516 (0.61/day)
System Name Money Hole
Processor Core i7 970
Motherboard Asus P6T6 WS Revolution
Cooling Noctua UH-D14
Memory 2133Mhz 12GB (3x4GB) Mushkin 998991
Video Card(s) Sapphire Tri-X OC R9 290X
Storage Samsung 1TB 850 Evo
Display(s) 3x Acer KG240A 144hz
Case CM HAF 932
Audio Device(s) ADI (onboard)
Power Supply Enermax Revolution 85+ 1050w
Mouse Logitech G602
Keyboard Logitech G710+
Software Windows 10 Professional x64
well my mobo is 4monhs old. so i guess they didnt change in all the places.

No yours is the new Q-Fan. The old one would tie all the 3 pin fan headers (except the psu one) to one setting and you got three choices: standard, turbo, and silent. The cpu had the same kind of settings but it was only for itself and as far as I know only works with 4 pin pwm fans.

edit: Went and looked up bios pics of your board and your right that it is still setup the old way.

Q fan pisses me off it's some thing they should of perfected by now. Like i can set the CPU fan to a nice silent speed and when it gets hotter it goes faster but once it's cooled down it stays at high speed.

Sounds like a bios problem that should be easily fixed once it is.
 
Joined
Aug 12, 2007
Messages
58 (0.01/day)
My current board has standard, silent, turbo and manual for CPU and Chassis. when set to manual you can set low and high temps and PWM percents for those temps. They limit chassis fan min to 60% which seems high, CPU you can drop to zero% but the fan still spins slowly below that set point - works pretty well but is not yet perfect.

The QFan software in windows will let you set points on a temp curve and assign PWM % to each point, but the software has to be running for it to work.
 
Joined
Mar 24, 2010
Messages
5,047 (0.94/day)
Location
Iberian Peninsula
My P55 Asus board has those options in BIOS, but many more in the AI-Suite. It works really well: anytime you do a game, benchmark or so, the CPU and chasis fans will start to speed up (and then down of course.)

Only bad point most Asus board are OR 3-pin OR 4-pin for the CPU, not both at the same time.

An yes, De.DasDude, the documentation is POOR POOR POOR: no improvement in mobo Manuals since 20 years!!
 
Top