PC Case rear fan

[burtie]

I just finished building my new PC and for the rear fan on the back I used my old fan from my old machine. After turning my machine on the fan blows at full force and doesn't stop and its really noisy...it sounds like a vacuum cleaner or a plane taking off lol
I disconnect the fan and the noise stops...is there a way to control the speed or should I get a new fan altogether?

I was looking at this one from ebyer: Antec 80mm Smartcool Thermally Controlled Case Fan - Ebuyer

 

[ken9122]

Are you connecting the fan to one of the fan connections on the mother board?

 

[Dwarf]

Hi burtie,

What size rear fan can your case actually accommodate? If it can take a 92mm or a 120mm fan then use one of that size. Its larger size means that to shift the same amount of air as an 80mm one, it doesn't need to spin as fast. This reduces the noise.

 

[burtie]

I plugged it in to SYS_FAN header on the mobo. My case can only accommodate 80mm.

 

[ken9122]

burtie, most mobo's control the fan speed based on CPU or chip temperature.
Try running 'speedfan". and see if you can set the speed settings.

Ken

 

[Jonathan_King]

My BIOS has a place to change the fan speed. Maybe that's worth looking into.

 

[ken9122]

Burtie, it might helpful if you filled it your system specs os we know which mobo you using.

Ken

 

[Fantail]

Just thinking the SYS_FAN header is 4 pin but if the fan is 3 pin could force it to run full speed. You might need a 3rd party controler that feeds off a molex. Newegg has jazz like that.

 

[burtie]

I have a Gigabyte S-series motherboard GA-G41M-ES2L
GA-G41M-ES2L (rev. 1.0) - GIGABYTE - Product - Motherboard - Specification

The manual says it has a 4 pin CPU fan header and a 3 pin system fan header.

Would I need a connector like this if I were to buy a 4 pin fan? 4-pin Molex to 3-Pin Female Socket Cable Adapter Sleeved [4FAN3PIN] : Performance-PCs.com, ... sleeve it and they will come

I was also thinking maybe of getting a quiet low noise fan. Would anyone have any suggestions? It doesn't have to be powerful just enough to vent the warm air from the back. I also have room at the front for another small fan and was thinking I could use another quiet one to suck cold air in, would that be more beneficial? How would I connect 2 fans if I only have one header for a system fan?

Thanks for your help

 

[CommonTater]

I was also thinking maybe of getting a quiet low noise fan. Would anyone have any suggestions? It doesn't have to be powerful just enough to vent the warm air from the back. I also have room at the front for another small fan and was thinking I could use another quiet one to suck cold air in, would that be more beneficial? How would I connect 2 fans if I only have one header for a system fan?

Thanks for your help

All fans make noise... the question is how much....

Ball bearing fans make more noise than sleeve bearings.
Bigger fans spin slower and make less noise.
Older fans often have wear in their bearings and make more noise.

Look for fans with "hydro dynamic" bearings. The shaft floats on a layer of oil inside a nylon bushing and the only thing you hear is airflow. Some of the better ones are these...

Newegg.ca - GELID Solutions Ltd.,case fan.

Newegg.ca - Rexus,case fan

I've always had good luck with the Rexus. They used to be Panaflo and I still have a couple of Panflo fans that have been running day and night for nearly 10 years.

Another trick you can use, if you feel like a little DIY, is to put a 10ohm 2 watt resistor in series with the red lead of the fan... a quick snip, a little solder, some heat shrink (or tape) and you have a fan spinning about 75% of full speed.

 

[Tepid]

I say, do yourself a favor and get a good new quiet fan. That really is the best option.

 

[icelatte]

May i suggest that you try to slightly lower the System Fan speed (not CPU fan)? As for my bios, i can see 100%, 82.5%, 75% and so on.

I set mine as 75% and the sys_fan becomes less noisy. I'm running a CoolerMaster 120mm on rear of case btw, on a Centurion 5 tower case.

And also please take note of the temperature of your CPU and Case when you change the speed just in case you get into overheating problems!

 

[Phone Man]

When I built my new system I used four of these guys.

Newegg.com - Antec 761345-75081-3 80mm Case Fan - Case Fans

They have a selector switch for 3 speeds but its on a short lead and inside the case so not convenient to change.

Then I got this guy to control my 4 case fans. Works by controlling the voltage to the fans. Will control 5 fans and also has 5 temperature probes and temp alarm. One feed from power supply to controller and fans feed from the controller. I normally run my fans at 50% and all is cool.

Newegg.com - NZXT Sentry-2 5.25" Touch Screen fan controller - Controller Panels

Newegg has lots of fans and also other fan controllers. Look at the CFM and dBa (noise) ratings.

Jim

 

[burtie]

Excellent thanks for the advice everyone. I will do a little shopping investigation and try one out