INTEL DG43NB auxiliary fan questionHi

all


MY MOTHERBOARD: DG43NB BIOS updated to: ver 0098 BIOS date: 9/28/2009


I have installed an auxiliary fan in my casing ( from an old branded system, as the fan is quite good )


fan specs :


NIDEC CO. MODEL TA450DC , 12V DC 1.4 Amps 4-pin connector.


this board supports 4pin connector for auxiliary fan.


as we know 4pin connectors function:

pin 1 : GND

pin 2 : +12V

pin 3 : Tacho / fan speed sensor ( mobo reads fan speed from this signal )

pin 4 : PWM control ( mobo controls fan speed from this signal )



I have two issues:


Q.1 At each cold start, aux fan spins at its full for a couple of seconds, many times it happens before windows desktop appears. Later also fan spins intermitently at full speed even when temps or normal. sometimes comes to normal in few seconds, sometimes 15, 20, 30 secs.

intel Desktop monitoring utility shows, fan failure ( not for this fan, for rear fan , while rear fan is functining properly)



rear fan shows '0 rpm' ( stopped ) while it is not,

intermittent warnings for other fan stop. while all fan works

aux fan still intermittently speeds up.


( when check in BIOS hardware monitoring menu, all fan shows working there )


Q.2 my aux fan is high speed approx 3000 rpm when at maximum, very heavy duty. when running at its full, it draws max current of approx 1.4 Amps ( as mentioned in fan specs)


---> DOES DG43NB BOARD support 1.4 amp for aux fan connector? or will it overload and may cause damage to board? ( my Power Supply is capable enough though )


I did'nt find this info (Max amps for fans supported by mobo) anywhere in DG43NB tech specs, guides etc


please help