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Why cant I change my fan speed with my new fan in my bios or fanspeed?

post #1 of 7
Thread Starter 
First off I have a couple of fans and I have been able to change the fan speed in the bios using manual fan control but I just bought a scythe ultra kaze 3000rpm fan and it wont let me adjust the rpm of it except for in one fan slot on my mobo which in the bios at 1% fan speed reads at 2000rpm in HWMonitor. I also tried fanspeed and it did the exact same thing as my bios, wouldnt change excet for the one slot to 2000rpm. So what gives? I dont want to buy a fan controller I'd rather just do this in the bios. Help anyone?
post #2 of 7
What motherboard do you have?

Do you have a PWM fan plugged into a DC header or a DC fan plugged into a PWM header?
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
4770K @ 4.7GHz / 4400MHz Asus Sabertooth Z87 Gigabyte GTX 780 OC 8GB G.Skill Trident X 9-11-11-31-1T @ 2400MHz 
Hard DriveOptical DriveCoolingOS
OS SSD 840 Pro 256GB / FSX SSD 840 Pro 256GB LG DVD Thermalright SB-E x2 Win7 Ult 64b 
MonitorKeyboardPowerCase
Viewsonic VP2655wb 25.5" IPS LCD Logitech Wireless EX1110 w/Mouse Corsair AX860i CM HAF-X 
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My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
4770K @ 4.7GHz / 4400MHz Asus Sabertooth Z87 Gigabyte GTX 780 OC 8GB G.Skill Trident X 9-11-11-31-1T @ 2400MHz 
Hard DriveOptical DriveCoolingOS
OS SSD 840 Pro 256GB / FSX SSD 840 Pro 256GB LG DVD Thermalright SB-E x2 Win7 Ult 64b 
MonitorKeyboardPowerCase
Viewsonic VP2655wb 25.5" IPS LCD Logitech Wireless EX1110 w/Mouse Corsair AX860i CM HAF-X 
  hide details  
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post #3 of 7
Thread Starter 
I have an evga 750i sli ftw. I honestly dont know what that means but the fan header on the mb is 4 pin for my cpu. my fan header for my scythe ultra kaze is only 3 pins. I plugged the fan into another 3 pin header on my mb and set the fab speed in my bios to 1% and it was reading at 2000k rpm on a 3000k rpm fan. All the other slots just read at 3000k rpm even tho they were set at 1% fan speed.
post #4 of 7
You need a 4-pin fan on a 4-pin header to control the fan speed. A three pin connector just monitors fan speed but can not adjust the speed.
post #5 of 7
Thread Starter 
Any other solutions you can think of without buying a fan controller? I dont want to return this fan. I'm sick of buying crap. How come I can adjust the fan speed on my chasis from 3000rpm to 2000rpm? If i set my chasis fan at 1%?
Edited by lowkickqop - 12/2/11 at 5:09pm
post #6 of 7
EVGA 750i SLI FTW has six fan headers. One 4-pin (mainly for the CPU fan) one and five 3-pin ones.
670

Of these six fan headers, only three can be controlled automatically. And, only two of these three can adjust the fan speed based on temperature settings. These two are the CPU Fan header and Chassis Fan header (at the lower right corner of the motherboard). See pic below.
243


I suppose it is the Chassis Fan header that you are currently having control over the Scythe Kaze 3-pin fan.
If you do not need the temperature feature, try the nForce fan header.


There is a BIOS (version SZ1K, dated 1st Dec 2009) available. Check to see if your current BIOS is older than this one. If so, perhaps update to this one which may (or may not) provide better Dynamic Fan Control feature. But be careful as flashing BIOS always involves a risk. If you are not comfortable, just do not do it.
456
post #7 of 7
Thread Starter 
Still the same thing. Wasnt able to get fan speed down any more than I already tried.
Edited by lowkickqop - 12/2/11 at 6:43pm
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