Overclock.net › Forums › Cooling › Air Cooling › Fan doesn't start right away.
New Posts  All Forums:Forum Nav:

Fan doesn't start right away.

post #1 of 6
Thread Starter 
Ok, So I have a brand new Asus Sabertooth 990FX AM3+ motherboard, that I only installed two days ago and I've noticed every time I power up the rear chassis fan (A CoolerMaster Turbine Mach 0.8 (800RPM)) doesn't start up automatically.

My front chassis fan does start (its also limited to 800rpm) and continues to run well, the CPU fan (the stock fan of a CM Hyper TX3 Evo) also runs well, but that rear fan doesn't. After about 2 seconds it starts of its own accord and continues to run fine.

Its no immeadiate issue to the computer since the sides are meshed and cooling is optimal for the components.

I do notice, if it helps any, that when I press the power button you hear a rush of air as the fan's all start and then it settles down into the consistant noise you would hear with the fan's running normally.

Nothing has been overclocked or changed in any way, all components are running at stock standards.

My PSU is a OCZ ModXStream 600W (with current estimates of all components only taking about 500w at max load)

So any thoughts on this would be greatly appreciated.
post #2 of 6
If it starts up pretty soon, id say you are fine. Dont worry about it.
First Beginnings
(16 items)
 
Easy Storage
(11 items)
 
 
CPUMotherboardGraphicsRAM
i5 3570k GA-P67A-UD7-B3 Gigabyte R9 270x G.SKILL Ripjaws X Series 1600mhz 
Hard DriveHard DriveCoolingOS
Crucial M4  Seagate Barracuda  Corsair H60 Windows 8.1 Professional 
MonitorMonitorKeyboardPower
Acer A231H 23" Acer M230A 23" LCD 1080p Razer Lycosa CORSAIR HX 850W 
CaseMouseAudio
AZZA Hurrican 2000 CSAZ-2000 Razer Lachesis Hercules XPS 5.1 70 Slim 
CPUMotherboardGraphicsRAM
I5 2500k Gigabyte P67X-UD3-B3 XFX 6870 GSkill DDR3-1333 
Hard DriveOptical DriveOSKeyboard
Seagate Barracuda  Samsung Blu-Ray Windows Home Server 2011 Logitech Wireless Combo MK260 
PowerCaseOther
Antec NEO ECO 520C 520W NZXT Source 210 ARCTIC F12 120mm (x5) 
  hide details  
Reply
First Beginnings
(16 items)
 
Easy Storage
(11 items)
 
 
CPUMotherboardGraphicsRAM
i5 3570k GA-P67A-UD7-B3 Gigabyte R9 270x G.SKILL Ripjaws X Series 1600mhz 
Hard DriveHard DriveCoolingOS
Crucial M4  Seagate Barracuda  Corsair H60 Windows 8.1 Professional 
MonitorMonitorKeyboardPower
Acer A231H 23" Acer M230A 23" LCD 1080p Razer Lycosa CORSAIR HX 850W 
CaseMouseAudio
AZZA Hurrican 2000 CSAZ-2000 Razer Lachesis Hercules XPS 5.1 70 Slim 
CPUMotherboardGraphicsRAM
I5 2500k Gigabyte P67X-UD3-B3 XFX 6870 GSkill DDR3-1333 
Hard DriveOptical DriveOSKeyboard
Seagate Barracuda  Samsung Blu-Ray Windows Home Server 2011 Logitech Wireless Combo MK260 
PowerCaseOther
Antec NEO ECO 520C 520W NZXT Source 210 ARCTIC F12 120mm (x5) 
  hide details  
Reply
post #3 of 6
Thread Starter 
Fair enough, I'll take your judgement on this. I did read in a review of the fan that it takes a certain voltage to actually start running, so I guess its just that fact.
post #4 of 6
no problem. My cpu stock fan on my sever takes about 5 seconds to start. scared the crap out of me the first couple times. Since its just a rear fan it shouldnt be an issue.
First Beginnings
(16 items)
 
Easy Storage
(11 items)
 
 
CPUMotherboardGraphicsRAM
i5 3570k GA-P67A-UD7-B3 Gigabyte R9 270x G.SKILL Ripjaws X Series 1600mhz 
Hard DriveHard DriveCoolingOS
Crucial M4  Seagate Barracuda  Corsair H60 Windows 8.1 Professional 
MonitorMonitorKeyboardPower
Acer A231H 23" Acer M230A 23" LCD 1080p Razer Lycosa CORSAIR HX 850W 
CaseMouseAudio
AZZA Hurrican 2000 CSAZ-2000 Razer Lachesis Hercules XPS 5.1 70 Slim 
CPUMotherboardGraphicsRAM
I5 2500k Gigabyte P67X-UD3-B3 XFX 6870 GSkill DDR3-1333 
Hard DriveOptical DriveOSKeyboard
Seagate Barracuda  Samsung Blu-Ray Windows Home Server 2011 Logitech Wireless Combo MK260 
PowerCaseOther
Antec NEO ECO 520C 520W NZXT Source 210 ARCTIC F12 120mm (x5) 
  hide details  
Reply
First Beginnings
(16 items)
 
Easy Storage
(11 items)
 
 
CPUMotherboardGraphicsRAM
i5 3570k GA-P67A-UD7-B3 Gigabyte R9 270x G.SKILL Ripjaws X Series 1600mhz 
Hard DriveHard DriveCoolingOS
Crucial M4  Seagate Barracuda  Corsair H60 Windows 8.1 Professional 
MonitorMonitorKeyboardPower
Acer A231H 23" Acer M230A 23" LCD 1080p Razer Lycosa CORSAIR HX 850W 
CaseMouseAudio
AZZA Hurrican 2000 CSAZ-2000 Razer Lachesis Hercules XPS 5.1 70 Slim 
CPUMotherboardGraphicsRAM
I5 2500k Gigabyte P67X-UD3-B3 XFX 6870 GSkill DDR3-1333 
Hard DriveOptical DriveOSKeyboard
Seagate Barracuda  Samsung Blu-Ray Windows Home Server 2011 Logitech Wireless Combo MK260 
PowerCaseOther
Antec NEO ECO 520C 520W NZXT Source 210 ARCTIC F12 120mm (x5) 
  hide details  
Reply
post #5 of 6
The fan I have on one of my mobo PWMs does the same thing. ~4 second delay from starting the comp to the fan spinning up. Nothing to worry about.
    
CPUMotherboardGraphicsRAM
Intel Core i7 920 SABERTOOTH X58 Gigabyte GTX 970 Corsair  
Hard DriveHard DriveHard DriveCooling
WD 320GB WD 1TB Hitachi 1TB CM Hyper 212 Plus 
OSMonitorMonitorPower
Windows 10 Pro 24" Sceptre 20" Asus Corsair TX750 
Case
Antec 1200 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel Core i7 920 SABERTOOTH X58 Gigabyte GTX 970 Corsair  
Hard DriveHard DriveHard DriveCooling
WD 320GB WD 1TB Hitachi 1TB CM Hyper 212 Plus 
OSMonitorMonitorPower
Windows 10 Pro 24" Sceptre 20" Asus Corsair TX750 
Case
Antec 1200 
  hide details  
Reply
post #6 of 6
Quote:
Originally Posted by Houndex View Post

Ok, So I have a brand new Asus Sabertooth 990FX AM3+ motherboard, that I only installed two days ago and I've noticed every time I power up the rear chassis fan (A CoolerMaster Turbine Mach 0.8 (800RPM)) doesn't start up automatically.
My front chassis fan does start (its also limited to 800rpm) and continues to run well, the CPU fan (the stock fan of a CM Hyper TX3 Evo) also runs well, but that rear fan doesn't. After about 2 seconds it starts of its own accord and continues to run fine.
Its no immeadiate issue to the computer since the sides are meshed and cooling is optimal for the components.
I do notice, if it helps any, that when I press the power button you hear a rush of air as the fan's all start and then it settles down into the consistant noise you would hear with the fan's running normally.
Nothing has been overclocked or changed in any way, all components are running at stock standards.
My PSU is a OCZ ModXStream 600W (with current estimates of all components only taking about 500w at max load)
So any thoughts on this would be greatly appreciated.

seems to me that you have your mobo controlling the speed of your fans.
the mechanism of this system will depend on the temperature.
there are two possibilities that your rear fan not spinning when your system start;
first, it simply need higher voltage to start.
the second, your system temperatures were too low for the fan to start (which again, the voltage was too low for the fan to start)

you should be able to fix this by tweaking your fan setting on the bios though wink.gif


as for your CPU fan that ramp up during the start.
it's what we called the kick-start.
the point of this kick-start was to avoid something happen with your rear fan,
since fans are usually need a higher voltage to start, while they still can spinning on lower voltage
(you usually will see something like; minimum operating voltage @5v, fan startup @7v)
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › Fan doesn't start right away.