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Cant Seem to run CPU fans at 100%

post #1 of 11
Thread Starter 
Hi All,

So i've got a Asus P8z68 v pro, i7 2600 and a D14 with three Akasa vipers on it, (connected using an Akasa 5 fan splitter - So PSU powers the CPU fans)

MY problem is that with fan xpert I cant get the fans to go higher than 1750rpm. The max speed is 1900rpm

So even under prime 95 I can get the cpu fans up to max rpm.

I've done the test thing in fan xpert, but it simply wont go faster.

Any one any ideas?

thanks in advance.
post #2 of 11
connect fans to mobo...
post #3 of 11
Thread Starter 
Quote:
Originally Posted by PontiacGTX View Post

connect fans to mobo...

Hi,

The fans are connected to the mobo, via a akasa 5fan cable tht also plugs into the psu. So the psu powers the fans but the mobo/cpu regulates the rpm. Sorry should have said before.
post #4 of 11
dont use fan splitters
post #5 of 11
I'm a Akasa Viper 120 owner.
I've had used the Akasa 5 fan splitter before.

Usually the Viper at full blast are around 1850 rpm.

Try to hook the splitter cable and the Vipers in the PWR FAN 3-pin.
The fans should run at 12v then check the fans speed.

Hook any case fan in the CPU FAN in order to avoid the system warnings.
300R Rig
(7 items)
 
  
CPUMotherboardRAMHard Drive
Core I5 3570K Asus P8Z77-V LX Corsair Vengeance 8GB 1600 MHz DDR3 Seagate 2T 7200 RPM SATA 3 
Optical DriveCoolingCase
DVD R/W Sony Hyper 212+ Push Pull Corsair 300R 
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300R Rig
(7 items)
 
  
CPUMotherboardRAMHard Drive
Core I5 3570K Asus P8Z77-V LX Corsair Vengeance 8GB 1600 MHz DDR3 Seagate 2T 7200 RPM SATA 3 
Optical DriveCoolingCase
DVD R/W Sony Hyper 212+ Push Pull Corsair 300R 
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post #6 of 11
Quote:
Originally Posted by PontiacGTX View Post

dont use fan splitters
Please explain how using the Akasa PWM splitter can in any way be a problem.

PWM splitters supply 12v to fan directly from PSU and PWM signal directly from motherboard.. and sends RPM signal to motherboad from master fan. PWM splitter supplies at least as good a power source and may be a better source than motherboard because it is direct from PSU!
post #7 of 11
Quote:
Originally Posted by tom_gr7 View Post

Hi All,
So i've got a Asus P8z68 v pro, i7 2600 and a D14 with three Akasa vipers on it, (connected using an Akasa 5 fan splitter - So PSU powers the CPU fans)
MY problem is that with fan xpert I cant get the fans to go higher than 1750rpm. The max speed is 1900rpm
So even under prime 95 I can get the cpu fans up to max rpm.
I've done the test thing in fan xpert, but it simply wont go faster.
Any one any ideas?
thanks in advance.
Do the fans run faster if you unplug the lead from motherboard? If they do than the PWM control is the source of problem. If they do not than that as fans as the fans will run. Fans typically have a 10% speed variable so 1750rpm is 150rpm off of 1900rpm free air spec.. that's a little less than 8%. Fans may spin 1900rpm when not attached to anything and cooler resistance is slowing them down some. There is almost no chance of the PWM splitter being the problem.
post #8 of 11
Thread Starter 
thanks for the replies guys smile.gif

i connected the fans up to my fan controller, I cant see the fan speed or even tell if the fans are running faster.

I will try plugging one into the mobo and checking then.

Tom
post #9 of 11
connect them to your psu
post #10 of 11
Thread Starter 
Quote:
Originally Posted by Carlitos714 View Post

connect them to your psu

hey, they are already powered by the PSU so i dont think that would help.

I connected them to a pwr fan header on the mobo and i got around the same speed.

With that being said, I guess the fans just aint as fast as they were two years ago.

- unless anyone else has any other suggestions?
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