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What is better for case? PWM or not?

post #1 of 9
Thread Starter 
I can't decide which one I should pick... the only difference is PWM. It will be mounted to a case.

Anybody know the real difference and have a suggestion as to which I should go for?


Noctua NF-R8
http://www.noctua.at/main.php?show=productview&products_id=9&lng=en
80x80x25mm
3-pin, 1800/1300/800rpm

Noctua NF-R8 PWM
http://www.noctua.at/main.php?show=productview&products_id=45&lng=en
80x80x25mm
4-pin PWM, 1800/1300rpm max.

Thanks.
post #2 of 9
If only as a case fan, non-PWM fans is enough. But why 80mm fans and not 120mm?
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post #3 of 9
Thread Starter 
Look here and click on spec: http://www.coolermaster-usa.com/landing/hafxb/

It has room for 2 x 80mm, I already know which ones to go with for the rest (FLX), but for this build without PWM is best then?
post #4 of 9
If the only difference is PWM, then in terms of pure cooling ability, there will be no difference at all. The only benefit of PWM is the ability to vary the fan speed, which will make it run quieter when full speed is not needed.
So the PWM is technically 'better', but not if you're only looking at cooling performance. If you're board or fan controller supports PWM, and you care about noise levels, then get the PWM. If it doesn't support PWM, then just get the regular fan.
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post #5 of 9
3-pin fans can be hooked in the CHA/SYS FAN or in the psu using properly adapters.

4-pin fans are designed to be used in the CHA/SYS FAN or in the CPU FAN.

I would recommend the 3-pin fan if you don't have any extra board header to hook a new fan.
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post #6 of 9
Quote:
Originally Posted by ipollesion View Post

Look here and click on spec: http://www.coolermaster-usa.com/landing/hafxb/

It has room for 2 x 80mm, I already know which ones to go with for the rest (FLX), but for this build without PWM is best then?

I see, so that's for the HAF XB and looks like it is only for exhaust. I would say get the non-PWM version http://www.noctua.at/main.php?show=productview&products_id=9&lng=en them lower its RPM to around 800~1000 so it won't make much noise. You do not need a PWM fan because you only need to move air out from the hard drives. I think you can even live without the 80mm fan if your place is cool enough.
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post #7 of 9
Thread Starter 
Thanks for the input everyone, I'm learning a lot here for my first build.

Another question, how many fans can I connect with PWM to the Asus P8Z77 V-PRO?

What does the optimal PWM fan setup usually look like/how is it configured?

And does PWM let the motherboard control the fan speeds automatically?

This board has ASUS Fan Xpert 2; would that affect the fans if they are PWM (I think Fan Xpert 2 allows you to change speed settings, would the PWM fans still run as they are intended by lowering RPM if not needed?

Regards
post #8 of 9
Quote:
Originally Posted by ipollesion View Post

Thanks for the input everyone, I'm learning a lot here for my first build.

Another question, how many fans can I connect with PWM to the Asus P8Z77 V-PRO?

What does the optimal PWM fan setup usually look like/how is it configured?

And does PWM let the motherboard control the fan speeds automatically?

This board has ASUS Fan Xpert 2; would that affect the fans if they are PWM (I think Fan Xpert 2 allows you to change speed settings, would the PWM fans still run as they are intended by lowering RPM if not needed?

Regards

1. Looks like you can plug up to 5 PWM fans to the motherboard.

2. Normally, you only use PWM fans for your CPU cooler so your fans will ramp up when needed. You do not need PWM fans for case fans.

3. Yup.

4. Dunno, I never used it biggrin.gif
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post #9 of 9

I have an NF-R8. I was disappointed. The Nexus Real Silent 80mm was better.

 

Good luck with your case. I wouldn't buy a case that size which required 80mm fans. All the 80mm fans I've ever played with don't move much air until they get pretty noisy. The only reasonable use for them these days is on the edge of a thin case, where even a 92mm fan is too wide.

 

Even in a flow-through PSU, I don't like 80mm fans. That's why, after my first PSU, I have avoided such PSU designs.

 

As I said, good luck.

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