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Which way to configure fan direction

post #1 of 5
Thread Starter 
Im building a HTPC with some "beefy" hardware (beefy for htpc that is). Need your guys opinions on fan direction to best balance the flow. My case has 4x 140mm fan locations, 2 on either side, but only 3 can be used since the psu will occupy one. The lid has a 140mm vent that'll serve as the exhaust for my cpu cooler (Phanteks PH-TC14CS)
http://m.newegg.com/Product/index?itemNumber=N82E16835709013

My gpu will be an Asus GTX670 DC2 and PSU a Seasonic X750. My plan is to have my 3 case fans intake, and my cpu cooler, gpu, psu for exhaust... Will this be a good balance? My biggest concern is noise, so the slower my fans run the better.

3x 140 case intake
2x 140 cpu exhaust
2x 70(?)gpu exhaust
1x 120 psu exhaust

http://cdn.overclock.net/f/f9/f9d8d6de_IMG_20130804_012646.jpeg

http://cdn.overclock.net/9/94/9459c6d0_IMG_20130804_013427.jpeg

Lian-Li PC-C60
AsRock Z77 OCF
I5 3570K
Phantek PH-TC14CS cooler
8gb Gskill sniper 1866
Asus GTX670 DC2
Ceton Quad-tuner
Seasonic X750 PSU
Asus blu-ray drive
250gb 840 evo SSD
2tb wd green HDD
Edited by MoPar Kid - 8/4/13 at 1:57am
post #2 of 5
Looks good to me.

I would have the fan on 14CS moving air from motherboard up toward top exhaust vent. My experience with these flat coolers when airflow is down heated exhaust air turns onto motherboard, turns up when it hits GPU, RAM, I/O housings.. and gets sucked back into fan. When fan moves air up through cooler airflow is over motherboard, up into cooler and heated exhaust goes out of case.

Maybe use all PWM fans and use PWM signal from CPU fan socket and maybe PWM signal from GPU to control them. This allows them to idle at very low rpm and increase in speed as CPU/GPU increase their airflow to cool when they work. wink.gif All of my builds are this way now. Only potential problem is 14CS fan is not PWM but uses a PWM adapter.. so does not change rpm the same as normal 1200-1300rpm PWM fan does.
post #3 of 5
Thread Starter 
Quote:
Originally Posted by doyll View Post

Looks good to me.

I would have the fan on 14CS moving air from motherboard up toward top exhaust vent. My experience with these flat coolers when airflow is down heated exhaust air turns onto motherboard, turns up when it hits GPU, RAM, I/O housings.. and gets sucked back into fan. When fan moves air up through cooler airflow is over motherboard, up into cooler and heated exhaust goes out of case.
Yeah the cooler will definitely be exhausting out the top. The second pic shows the vent location.
Quote:
Maybe use all PWM fans and use PWM signal from CPU fan socket and maybe PWM signal from GPU to control them. This allows them to idle at very low rpm and increase in speed as CPU/GPU increase their airflow to cool when they work. wink.gif All of my builds are this way now. Only potential problem is 14CS fan is not PWM but uses a PWM adapter.. so does not change rpm the same as normal 1200-1300rpm PWM fan does.
Im still trying to understand how PWM differs from DC? I understand PWM allows for greater variable according to load via temp sensors. Do some boards offer the same feature for DC fans? How do spliters work?

My board is an an AsRock Z77 oc formula. Its has a UEFI feature called Fan-tastic tuning that "offers the flexibility to adjust the fan speed (RPM) relative to the system temperature". Doesn't specify if its also for DC fans. Sorry, Im still a newb :/.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157328
Edited by MoPar Kid - 8/4/13 at 6:34am
post #4 of 5
PWM is Pulse-Width Modulation... the length and number of pulses of 12v power sent to fan controls the speed instead of changing the voltage. This is done using a small circuit board in the fan itself. Fan has 4 wires; neutral, 12v, rpm signal & PWM signal. The 12v power can be supplied directly from PSU using a PWM splitter with molex or sata power connector. The fan plug on splitter goes to PWM socket on motherboard. One of the fan sockets is a "master" that sends rpm signal to motherboard where it is processed by PWM and sends the PWM signal to the fan's circuit board that sends 12v pulses to the fan motor.

There is no energy being wasted as heat while changing 12volt to 9volt or whatever.

Best PWM splitter is 8 fan Swiftech PWM splitter. Cheaper ones like Gelid and Akasa for 3-5 fans are also available.
post #5 of 5
Quote:
Originally Posted by MoPar Kid View Post


My board is an an AsRock Z77 oc formula. Its has a UEFI feature called Fan-tastic tuning that "offers the flexibility to adjust the fan speed (RPM) relative to the system temperature". Doesn't specify if its also for DC fans. Sorry, Im still a newb :/.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157328

Thing is with motherboard voltage control you can only do a few fans. With motherboard PWM control you can run many fans.
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