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PWM fans all show different speeds, and CPU fans won't spin up...confused

post #1 of 21
Thread Starter 
first of all it's this MB http://www.gigabyte.us/products/product-page.aspx?pid=4153#ov

and this CPU cooler http://www.phanteks.com/PH-TC14PE.html

...and these case fans http://www.frozencpu.com/products/15137/fan-960/Deep_Cool_UF140-X_140mm_x_25mm_Ultra_Silent_PWM_Fan_w_De-Vibration_TPE_Cover_120140mm_Mounting_Hole_Pattern.html#blank

ok, first of all, the phantek has 2 fans, and I have them attached to the included splitter and attached to the CPU fan header. when I first turn on the PC, they won't spin at all unless I give them a gentle nudge, then they spin up. it's like maybe the single header on the board doesn't have enough power to spin them both at startup?

secondly, I put 4 of the deep cool fans in the case for giggles and experimenting with temps, 2 as intake 2 as exhaust. they are all connected to separate 4 pin sys fan headers on the board. bios though only shows sys 1 2 and 3 as being controllable, and there is one bios setting to control the PWM function of all 3 headers. even so, sys 1 shows RPM of about 100 while sys 2 and 3 show RPM of 650 on startup. sys 4 is showing 1400 RPM, so I'm guessing that header is fixed voltage or something? can't figure out why 1 fan would be slower than the other 2. it's not the fan either, I switched a couple around and same thing happens.

I need to figure out how to get my CPU fans to spin up first off, and then hopefully get the case fans sorted. this setup is offering far less control than I thought I would have.

can anybody help? thanks in advance
 
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post #2 of 21
Just because it's a 4-pin fan header does not mean it's a PWM fan header.

AFAIK the only 4-pin fan headers that are PWM are CPU fan headers.

Most motherboard have 4-pin headers that are not PWM , even when the manual says they are. ASUS has lied abouot this with at least one board & manual.

PH-TC14PE:
Are the fans 4-pin fans?
Is motherboard bios set to PWM, auto or voltage control?
post #3 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

Just because it's a 4-pin fan header does not mean it's a PWM fan header.

AFAIK the only 4-pin fan headers that are PWM are CPU fan headers.

Most motherboard have 4-pin headers that are not PWM , even when the manual says they are. ASUS has lied abouot this with at least one board & manual.

PH-TC14PE:
Are the fans 4-pin fans?
Is motherboard bios set to PWM, auto or voltage control?


thanks for responding, the MB is set to PWM control, or manual mode as bios calls it. there are several different "slopes" you can choose

the phantek fans are 3 pin that go to a splitter and then a 4 pin connector to the MB
 
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post #4 of 21
Okay, the fans are not PWM. There should be a PWM adapter included with the TC14PE. It looks like a fan silencing piece with 4-pin PWM plug on one end and 3-pin socket on other. Plug it into CPU fan header and plug the Y splitter with fans into the adapter. That should give you PWM control of the fans.
post #5 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

Okay, the fans are not PWM. There should be a PWM adapter included with the TC14PE. It looks like a fan silencing piece with 4-pin PWM plug on one end and 3-pin socket on other. Plug it into CPU fan header and plug the Y splitter with fans into the adapter. That should give you PWM control of the fans.


thanks for responding

that is how I have it set up. and it seems to work ok, as I can hear the fans increasing RPM when I stress the system. the issue with the cpu cooler is that when I first turn on the computer the fans don't spin at all. I have to manually spin them to get them to start. if I don't do that, even if I stress the system, they won't spin
 
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post #6 of 21
Try using just one fan and see if it spins up.
post #7 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

Try using just one fan and see if it spins up.

it spins up fine with one fan. either one. also, if I disable PWM and speed control altogether, both fans spin up fine (and run fullllllllll speeeeeed aheaaaaaaad)

also, if I disable speed control for the sys fans, then 1, 2, and 3 all spin at the same speed - wide open. Sys 4 was already doing this as there doesn't seem to be any way to control that one. interestingly sys 1-2-and 3 still spin about 100-200RPM slower than sys4.
 
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post #8 of 21
So we know it's not the cooler fan.. but we do not know if the CPU fan header is putting out PWM or voltage control. Try running a cooler fan on PWM with the adapter with bios set to PWM and see if that works.

1,2 & 3 spinning slowing may be motherboard, may be vent / grill / filter restriction, or may be factory tolerance of fans.. +/- 100-200rpm is normal spec tolerance.
post #9 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

So we know it's not the cooler fan.. but we do not know if the CPU fan header is putting out PWM or voltage control. Try running a cooler fan on PWM with the adapter with bios set to PWM and see if that works.

1,2 & 3 spinning slowing may be motherboard, may be vent / grill / filter restriction, or may be factory tolerance of fans.. +/- 100-200rpm is normal spec tolerance.

the CPU header has both PWM or voltage control, the issue is the same regardless of which is selected.

agree, I'm not concerned with the 100-200 rpm difference, but I am concerned with sys1 not spinning the fan faster than about 150RPM when set to PWM
 
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post #10 of 21
If PWM is selected I would expect the 3-pin fan to run full speed all the time. PWM pinout is grd, 12v, rpm, PWM. Fan gets 12v all the time. PWM fans have a small PCB that receives PWM signal and pulses the 12v power going to fan to control it's speed.
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