Fan configuration for Corsair 780t?

Mookeylama · May 5, 2017

basically my 1st build, (well gonna have Micro Center build it) and i'd like help w/ fan layout. the 780t comes w/ 3 140 fans. i'll be air cooling (Noctua NH-U14S), and would like as little dust as possible. so i guess Positive pressure? was planning on using these fans
https://smile.amazon.com/gp/product/B00KFCRF1A/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
NF-A14 Industrial 3000 PWN. maybe 3 of those? any advice appreciated!

Lutfij · May 5, 2017

No matter what form of filter you use there will always be dust accumulation over time due to fine/granular nature of dust. That being said, the case you're working with would be best oriented in having all the fan mounting locations(intake and exhaust) populated with fans of equal RPM. You could also experiment with which form of setup beneifts you the most in terms of thermals and the amount of dust collected. This will be a long term goal. The pioneers of case makers with positive air pressure being their key element are Silverstone.

In short, if you want to get fans, get them for all possible mounting locations. Not a bad fan choice though they aren't exactly cheap if you factor in more than 3 fans in your case.

Mookeylama · May 5, 2017

thanks! was hoping for recommendations for intake, exhaust. think i read that some (SP?) fans could be at a higher rpm while other fans were lower?

Mookeylama · May 6, 2017

https://www.newegg.com/Product/Product.aspx?Item=N82E16811139049&ignorebbr=1&nm_mc=KNC-GoogleAdwords-PC&cm_mmc=KNC-GoogleAdwords-PC-_-pla-_-Cases+%28Computer+Cases+-+ATX+Form%29-_-N82E16811139049&gclid=CKDny7u-3NMCFZE8gQodiQQCow&gclsrc=aw.ds
ok the 780t comes w/ 3 , 140mm fans. two in front, one in rear exhaust. then i'll put two NF-A14 iPPC-3000 PWM at the top (exhaust or intake??). and then put two of these 120mm at the bottom (removing an hdd tray)...
https://www.amazon.com/gp/product/B01G5I6MUW/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

i think that covers all available fan spots (maybe an angled 120 on an L bracket at the gpu). BUT i'm not sure if this will give me positive pressure (for dust). or if i can connect some fans to the included case fan controller or if all should be connected to the mobo for PWM, or even a bay fan hub.
it's my understanding that PWM control on the fans means i can set them thru bios or software to automatically come on or ramp up/down when certain temps are reached. if so, then should i even have any fans connected to the included 780t fan controller?

Lutfij · May 6, 2017

In short, if you want to get fans, get them for all possible mounting locations.

As far as dust is concerned, you do realize that mechanical forcing air will inadvertently force dust alongside the air? All you can do is reduce the amount of dust entering but over a long period of time, it'll yet accumulate.

If you want to avail all your fans to work off PWM, you will find it most helpful to buy a PWM splitter like this one and have all your fans(both intake and exhaust) off that. To connect the fans you can either have them off the motherboard+PWM fan hub or the controller, not both at the same time(to override one or the other).

For fan orientation, front and bottom should be intakes while the top and rear should be exhausts.

You're welcome!

Mookeylama · May 7, 2017

yep, thank you much!! yeah i realize dust is gonna get in regardless. i'm trying to follow these recommendations, and minimize it...
https://www.youtube.com/watch?v=4NYHC3DXynM
http://files.tested.com/photos/2013/02/08/44527-ss_airflow.png

#1. "For fan orientation, front and bottom should be intakes while the top and rear should be exhausts." --will that get me the positive pressure? and if so, will those fans i listed be okay for static pressure? they both seem to have good ratings in both airflow AND static.

#2. as for PWM; so i need to have ALL fans on pwm or NONE? i was hoping to use the fan controller included on the 780t (i think it controls 3 fans) to control 3 fans and then have the rest on an auto pwm thru ASUS Suites or bios. it's better to have all fans on auto pwm?
if so, then i may just get the Corsair 750d Airflow rather than 780t, as i liked the fan controller on 780t. but then, the 780t does have full air filters along the bottom. 750d only under psu

#3. thanks for the link on that pwm splitter! i'm a sucker for something i can touch tho, like that 780t controller. would any of these addons work as pwm that would automatically adjust according to temp?...
https://www.newegg.com/Product/Product.aspx?Item=9SIAA8S4F70199
https://www.newegg.com/Product/Product.aspx?Item=N82E16811997141&cm_re=pwm_fan_controller-_-11-997-141-_-Product
https://www.newegg.com/Product/Product.aspx?Item=9SIA50M2EM2392&cm_re=pwm_fan_controller-_-9SIA50M2EM2392-_-Product

Lutfij · May 7, 2017

1| You may want to read through this since you're going on about positive and negative air pressure. I for one am trying to get by with the basic rule of physics whereby hot air travels upwards(hot air is less dense and so moves upwards). In the scenario of a PC case, that hot air will travel out the top and/or the back as they are located at the highest point. Following that, cooler air can only be found lower when compared to heated air this is why I've suggested having a bottom fan mount draw air in. As a followup, the logical area for air to flow through if bottom mounted locations are dust magnets is the front of the chassis.

2| If I were you I'd get all fans in PWM flavor and have them all plugged onto the PWM hub. The PWM hub can then be connected to a PWM fan header on your motherboard, like CPU_OPT, and via BIOS the fans RPM will flux with respect to the CPU's temps or follow a particular fan curve/profile.

3| If you're looking at fan controllers, they don't allow for PWM control but they do offer granular level of control however that sort of thing is meant for people with custom watercooling loops. In fact they control a fan via voltage regulation as opposed to the pulse seen on PWM fans(and their headers). The disadvantage with fan controllers is the cabling mess and that each channel would be populated by one fan. If you add splitters per channel you can and will reduce the longevity of the fan controller. You need to understand that a fan controller operates by reducing the amount of power delivered to a fan. That reduced power translates to heat off a resistor which is the heart of any fan controller.

I don't understand why you'd want to spend more than twice the money over a PWM hub and get a physical fan controller...?

On second thoughts, mind sharing the rest of your (proposed)build?

Mookeylama · May 7, 2017

i'm just old and us old folks like things we can touch. knobs, dials. tactile lol. but i think i'll do the pwm splitter. sounds more efficient.

sure thing on the build...

780t case (or 750d)
evga g2 1000w (maybe 850, but i may sli later)
Corsair Vengeance LPX 32GB (4x8GB) DDR4 DRAM 3200MHz (is 2 sticks of 16gb better?)
https://smile.amazon.com/gp/product/B0143UM4TC/ref=ox_sc_act_title_11?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
ASUS z270 maximus Code
notua NH-U14S cooler
hoping for evga FTW3 1080ti but depends on availability
i7-6700k
windows 7 (for reasoning on 6700 and win7 see link)
http://www.tomshardware.com/answers/id-3407042/lga-2011-1151-gaming.html
basically this build...
https://pcpartpicker.com/list/

my current pc caught fire. possibly house wiring. my post history discusses it some
so yeah, any advice or help appreciated! thanks again!

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