PWM fans not spinning

spluff

spluff

spluff

Soldato
Joined
19 Oct 2002
Posts
2,599
Hi allm

Just setup my PC and I have 2 Noctua NF12 PWM connected to a Y-cable to the PWM1 connector on the motherboard.

The fans spin up briefly at startup then do not move.

Is this OK?

Is this because the system does not think that it is hot enough to enable them yet?

Many thanks
spluff
 
Its confusing - in the bios you can set all system fans at once:-

1st/2nd/3rd system fan speed control:- Normal, Silent, Manual, Disabled

I have 2 PWM fans (NF-P12 PWM ) connected to sys-fan1 (these fans either run at full speed or not at all depending on what i select)

I have 1 normal fan (NF-P14) connected to sys-fan3 (always runs at full speed)

I have 1 normal fan (NF-P14) connected to sys-fan4 (always runs at full speed)

I am using a gigabyte Z77x-UD3H
 
Thanks for your replies....

a. the fans are connected to the sys fan headers (2 on the y splitter are PWM fans) the other 2 are individual on voltage.

b. the motherboard is a Gigabyte Z77x-UD3H - I didnt notice voltages for the fans - maybe I am wrong

Hopefully can sort this out :)
 
yeah if i set it to PWM then the 2 PWM fans change speed...

The other 2 voltage sys fans run at full speed... Can these be controlled too?
 
doesnt say anything about voltages - it mentions slope which affects the 2 PWM fans

the 2 140mm fans still run at full speed :/
 
thanks nkata - the fans were supplied with those kind of cables....

I was hoping that the motherboard / windows would allow adjust (automatic/manual) of the fan speed
 
My 2 PWM fans are Y-split to 1 sys-fan connector via the pre-supplied cable below:-

Extensive Cabling Options - The fan’s short 20cm primary cable minimises cable clutter in typical applications while the supplied 30cm extension provides extended reach when necessary. Both cables are fully sleeved and a 4-pin y-cable allows to connect a second NF-P12 fan to the same PWM fan header for automatic control.

I also have 2 140mm fans which are not PWM which are on 2 seperate sys_fan connectors
 
doyll said:
Bios on mine in
PC Health Status
I have to scroll to bottom of list (2 lines below bottom of screen) to find
CPU Smart FAN Control [enable]
CPU Smart FAN Mode [PWM]

From manual:

Hope it helps.
Click to expand...

These settings are for the CPU fan which is working fine on voltage....

I have problems with my 2 140mm voltage case fans connected to sys_fan connectors
 
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