4 pin case fan on 3 pin motherboard

[kevin0]

Hello
my case fan has a 4 pin connector and motherboard has only 3 pin connector the question is what will happen if i connect 4 pin case fan connector to a motherboard has only 3 pin connector ? and what is the different between 4 pin case fan connecting to 4 pin motherboard connector and 4 pin case fan connecting to 3 pin motherboard fan connector ? and what is the best ?
and i have a problem mounting the case fans with its screws i dont know how to install this fans I NEED HELP

motherboard: ASRock B85M (i connect case fans to CHA-fan1,2)
case fans : Cooler master blade master xtraflow 120mm

 

[cklaubur]

You can plug a 4-pin PWM fan connector into a 3-pin terminal on the motherboard without any problems. Without the fourth pin connected, the fan will just run at full speed.

As far as mounting the fan, some fans don't have the holes in the side threaded for screws, so the screws will need to cut their own threads in the fan. Just make sure they are centered, use a good-fitting screwdriver, and use a bit of muscle to get them in.

Casey

 

[burdenbound]

A 4 pin fan will work with a 3 pin motherboard fan slot. The fourth pin would be used for controlling fan speed so you will not have that functionality. Most case fans do not have pre grooved holes for the screws so when you initially put the screws in it's going to take a little elbow grease.

 

[s0c4]

You can plug in the 4 pin fan with your 3 pin motherboard. The fan will simply run at full speed. The 4-pin fans are often referred to as PWM fans, because the 4th connector is the what the motherboard or fan controller uses to modulate the power allowing the speeds to change. If you buy a aftermarket fan controller, you can use the 3-pin fans in the same manner as a 4-pin fan. I use 3-pin fans with a fan controller since my motherboard doesn't have enough fan headers for my case.

 

[kevin0]

Thank u all
what about 4 rapper pad came with the fans ? how can i use it ?
and coolermaster k280 front fan has a very weak airflow (i connect it to the power supply)

 

[kevin0]

Guys any help ?
- I get a screen or message tells me (Warning case open detected press F1 to continue) after installing case fans i want to know why i see this message ? and how to fix it ?
- after installing a two case fans cooler master i feel that i sit beside a helicopter ready to take off ! what is the best way to fix this problem ? (first fan has 4 pin and its connected to 3 pin motherboard connector second fan has 4 pin and its connected to 4 pin motherboard connector)
- and k280 case front fan has a too weak airflow i dont know why and i connect it to the power supply not the motherboard help me

 

[kevin0]

why there is no one answering me

 

[Mousemonkey]

Don't...

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