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Will these 4 (edit: 5) fans create enough airflow? - Page 2

post #11 of 14
You'd be lucky to get 40CFM from a 120mm fan at ~1200RPM , realistically you get 70-75% of free flow (in free air)
Quote:
i5 2500k (oc: 4.4Ghz @ 1.26V at the moment) and asus GTX670 with modded bios
I'd say the i5 @1.26V= about 120-130W
GTX 670 = about 170W stock bios, about 230W with modded BIOS

Your heat load is under 400W , it's about 350W max

The "rule of thumb' is CFM required = 1.76 x Watts / delta_T (°C) , where delta_T is temperature over ambient

CFM = 1.76 x 350W / delta_T
CFM = 616 / delta_T
assuming 4 fans of 30CFM that's 120CFM

120CFM = 616 / delta_T

manipulating --> 616 / 120 = delta T
so that's 5°C increase over ambient...
Edited by AlphaC - 11/25/13 at 7:30pm
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post #12 of 14
Quote:
Originally Posted by TiezZ BE View Post

Those CFM spec's are indeed never correct IRL mad.gif, I saw that in many reviews i've gone through, same with noiselevels. I personally choose noiseblocker fans because I want my rig to be quieter in my new case. It's in my living room and when i use it to watch series or an occasional movie it would be great if noise is lower. Also the static of the noiseblockers pressure seems decent enough to use them as a casefan if those reviews were correct.

Those phanteks look really nice, didn't do any research about phantek fans because the webshop i used doesn't sell them but the shop is near me and I can go pick them up myself (15-20 min's drive) to avoid international shipping cost (because it's in the netherlands).

Your link doesn't work here, is it this one? http://www.silverstonetek.com/techtalk_cont.php?area=en&tid=wh_chessis

I also found this one, which was posted in another thread: http://www.silverstonetek.com/techtalk_cont.php?tid=wh_positive&area=usa
Yes, that's the one.
Thanks for the link to poss/neg pressure case. Their GPU exhaust is only accurate for reference or simi-reference blower style GPU coolers. GPU coolers with multiple fans dump hot air everywhere.. all four directions.. making them much harder to keep their heated exhaust air from mixing with cool air supplying them.

My rule of thumb on case airflow is to have about 30% more cfm combined total of case airflow than combined total of CPU and GPU cooler fans... and all case fans are PWM speed controlled same as CPU & GPU fans by using their PWM signals. This way the case fans / airflow changes as he CPU & GPU fans / airflow changes. Cool and quiet when not working hard as all fans are idling 24-39c@700rpm; GPU 28c.. but as load increase fan speed increase keeping everything cool.. At 100% load 44-49c@950-1050rpm; GPU 44c.

CPU = TY-147 = 74cfm (2x TY-147 push/pull ducted out back of case)
GPU = 2x TY-100@44.5cfm = 89cfm (custom shroud to accommodate TY-100 fans)
Total = 164cfm

Case = 3x TY-140@74cfm = 222cfm (front, bottom & back grilles removed w/ silverstone FF141 filters)

Case 222cfm is 35% more than component fans 164cfm)

I'm about to start building my Phanteks Enthoo Primo. Haven't decided what and where for fans yet. Case came with 5x PH-F140SP fans (2x have blue LEDs). 2x front & 1x bottom intake with 1x back & 1x top exhaust. As I'm air cooling that should be plenty.. but I might add 1x more front (in optical bays) & 2x more bottom intakes with 2x more top exhausts. Than run them all at half the speed of component fans. With specs of 1.33mm/H2O & 82cfm@1200rpm there should be plenty of case airflow at 350-400rpm idle and 800-900rpm load.
Edited by doyll - 11/26/13 at 6:22am
post #13 of 14
Thread Starter 
wizardonthejob and your posts in page 1 made me do more research about the pressure levels in a case. And after I got the case I directly ordered that extra intake fan because of the design of the case. That extra 120mm intake fan will be really necessary imo to get the pressure up and blow everything to the back.

I think I will be very pleased when I periodically clean my new case. Been running my rig in an 12-15 year old chieftec case for 2 years now with 80mm fans and no filters, needed to clean it thoroughly at least 3-4 times a year.
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(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 6700k Asus Z170 gaming pro Palit Super Jetstream GTX 1080 Corsair Vengeance LPX 16GB 2800Mhz CL14 
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Crucial M4 128GB crucial mx100 256Gb Seagate 7200.14 2TB Sony Optiarc AD-7261S 
CoolingCoolingCoolingCooling
Cryorig H5 universal Noiseblocker NB-BlackSilentPro PL-PS 120mm (2x) Noiseblocker NB-Blacksilent XK2 140mm (2x) Noiseblocker NB-BlackSilentPro PL2 
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Mine
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 6700k Asus Z170 gaming pro Palit Super Jetstream GTX 1080 Corsair Vengeance LPX 16GB 2800Mhz CL14 
Hard DriveHard DriveHard DriveOptical Drive
Crucial M4 128GB crucial mx100 256Gb Seagate 7200.14 2TB Sony Optiarc AD-7261S 
CoolingCoolingCoolingCooling
Cryorig H5 universal Noiseblocker NB-BlackSilentPro PL-PS 120mm (2x) Noiseblocker NB-Blacksilent XK2 140mm (2x) Noiseblocker NB-BlackSilentPro PL2 
OSMonitorKeyboardPower
Windows 10 pro Asus VG248QE Logitech G610 brown Cooler Master Silent Pro M600 
CaseMouseAudio
Nexus Prominent R Zowie FK1 Asus Xonar D2/PM 
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post #14 of 14
Glad to help. If you need anything else just ask. thumb.gif
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