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How does "Fan Target Speed/Target Temperature" fan system work?

post #1 of 2
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I have an asrock extreme4 p67, I'm not sure if it works the same way on other p67 boards or not.

I have 2 values for CPU fan speed control:

Fan Target Speed (1-10)
Target Temperature (45c-65c)

I figured maybe it meant the fan will attempt to be at (target fan speed as percentage, 6 = 60%, etc) at the target temperature, and scale up/down from there, but that doesn't seem to be the case.

But that's not what it is - for instance fan speed 7 is definitely not 70%, because even at idle it spins my 2100 rpm fan up past 2000. So basically 7 and above are 100% fan all the time. Level 1 keeps the fan spinning at 1500 rpm even at idle temps.

The target temps also don't seem to affect how much the fans spin at low loads. The fan spins at the same RPM whether I set the target temp to 45c or 65c.

And under load, even with fan target speed 1 it still spins up to 2100 rpm.

What exactly is the logic behind how it handles those 2 numbers? My fan gets noticibly louder after 1800 rpm without that much extra cooling, so I'd like to cap the speed around there, but even the most lenient settings (fan target speed 1, target temperature 65c) end up running the fan at 100% 2100 rpm.
Edited by SenorBeef - 6/16/11 at 3:46am
    
CPUMotherboardGraphicsRAM
2500k @ 4.6 Extreme4 p67 5850 PCS+ 4x4 ripjaws X 1600 
Hard DriveCoolingOSMonitor
M4 128gb, WD BLACK 4 TB total Aegir Win7 Shimian 27" 1440p 
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Antec TP650 HAF 922 G400 (RIP 518) 
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CPUMotherboardGraphicsRAM
2500k @ 4.6 Extreme4 p67 5850 PCS+ 4x4 ripjaws X 1600 
Hard DriveCoolingOSMonitor
M4 128gb, WD BLACK 4 TB total Aegir Win7 Shimian 27" 1440p 
PowerCaseMouse
Antec TP650 HAF 922 G400 (RIP 518) 
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post #2 of 2
The logic behind it is:

Fan target speed = User specified number (Maximum fan speed / 10) (Eg, 1 being lowest fan speed and 10 being maximum)

Target temperature will ignore Fan target speed, and just run the fans on auto as to what your target temperature specifies. So if you set it to 50c, and it goes to 51c, the fans will speed up.

Thing is, fan readouts are notoriously inaccurate, it pretty much renders these settings useless. If you're really interested in it more I'd probably spring for a 5.25 bay fan controller.

Hope that helps.
The Iron Giant
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The Iron Giant
(19 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 950 X58A-UD3R Sapphire Radeon HD5870 Vapor-X Mushkin Silverline 3x4GB 1333MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung F3 Samsung F3 Western Digital Raptor Crucial M4 128GB 
Optical DriveCoolingOSMonitor
Sony DRU-87S Corsair H70 Windows 7 Ultimate x64 Acer X243HQBD 
KeyboardPowerCaseMouse
Ducky Shine III Seasonic X650 Lian Li Lancool K62 Zowie AM MS 
Mouse PadAudioAudio
Razer Goliathus Edirol MA-7A speakers. Sennheiser HD598 
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