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The optimal case fans for 750D with Magnetic Filter - Page 2

post #11 of 18
Are 2 of the fans you ordered to replace your NH-D14 fans?
It seems the only headers with PWM on your motherboard is CPU_fan & CPU_opt (split off of CPU_fan) headers, both supply same PWM signal The manual shows others being PWM but it is a lie! Google will give you all kinds of owners having problems with PWM... Several users here have reported this problem
http://www.overclock.net/t/1401311/asus-rampage-extreme-iv-pwm-problem/0_20
http://www.overclock.net/t/1353732/trouble-with-pwm-control-on-chassis-fan-headers-w-pwm-splitter/0_20
Let us know how it all works out.
Edited by doyll - 9/30/13 at 3:55am
post #12 of 18
Quote:
Originally Posted by Abula View Post

For anyone interested, i just finished my Fractal Design Define R4 build with MSI Z87-GD65, that has a very good PWM fan control on bios, i used 4x Noctua NF-A14 PWM (3x in and 1x out, mostly cause the intakes have filters and a more restrictive than the usual case). I wanted to try how much difference does case fan speed made on my setup, so via bios i setup the fans to not ramp up until 50C is reached, and to reach to the max rpms on 80C (this is the scenario for all the tests), on the MSI you can also limit the PWM % min and max, so in all tets the minimum i set was 12.5% (this is equivalent to 225rpm), and i did 4 different settings on top rpms (75%, 62.5%, 50% and 37.5%), i ran Prime95 v27.9 for about 30mins on each preset, on ambient temp of 22C, remember this only limits the top rpms of the case fans, all other settings were left unchanged, the case fans are the SYSFANIN sensor on HWmonitor below, the CPU fan is a TY150 for practical purposes of not moving anything else this was left the same on all tests, CPU_FAN1 (CPUFANIN) bios settings Temp: 50C-80C and PWM: 37.5%-100% on all tests, Warning: Spoiler! (Click to show)
Looks interesting but the problem is I can't read it... not even enlarged. frown.gif
post #13 of 18
Thread Starter 
Well on my motherboard, I know for a fact that three of them work with PWM, so here's hoping everything is ok.
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post #14 of 18
Quote:
Originally Posted by iNcontroL View Post

Well on my motherboard, I know for a fact that three of them work with PWM, so here's hoping everything is ok.
Facts can sometimes be misleading.
You know for a fact that three of them are regulating the speed of fans attached to them. But do you know for a fact that all three are using 12v power and PWM to control the fan speed.. or are some of them varying the voltage to control the speed?
PWM fan speed can be controlled both ways. wink.gif

When you get your fans and Swiftech 8-Way PWM splitter and hook it up to each header you will find out if they are really PWM controlled or not... because if any of them are not the fans will only run at full speed. biggrin.gif
post #15 of 18
Quote:
Originally Posted by iNcontroL View Post

Well on my motherboard, I know for a fact that three of them work with PWM, so here's hoping everything is ok.
Asus usually only has one true PWM fan header, even if all your headers seems like 4pin, im not familiar with the Extreme (too expensive for me), but i think its the same.
Quote:
Originally Posted by doyll View Post

Looks interesting but the problem is I can't read it... not even enlarged. frown.gif
I edited some to fit in a smaller size, maybe you can read it like this,



i99z.png
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post #16 of 18
Thanks mate. thumb.gif
Now when I click it enlarges to same size as the big version you posted with it. biggrin.gif
Find it interesting that idle minimum 227-229rpm case fans and 533-535rpm cpu fans with temps varying from 29-33c to 32-36c.
Maximum speed is 649-1095rpm case fans and 1031-1067rpm cpu fans with temps varying from 70-75c to 75-78c.

Appears the faster the case fans ran the slower the CPU fans ran with case and cpu temps remaining relatively constant... +/-1.5c. ??
post #17 of 18
Quote:
Originally Posted by doyll View Post

Find it interesting that idle minimum 227-229rpm case fans and 533-535rpm cpu fans with temps varying from 29-33c to 32-36c.
Maximum speed is 649-1095rpm case fans and 1031-1067rpm cpu fans with temps varying from 70-75c to 75-78c.
What i tried to show here, is that every 12.5% of pwm increase, it lowers 1C on the hotest core, weather the difference in noise is worth it its up to the end user, personally i take 4C easily for having a virtually inaudible setup, past 700rpm i start noticing the noctua fans.

You see difference between both fan on HWmonitor, mainly because they are different fans with different fan settings on the bios. the case fans are noctua nf-a14 pwm, connected to CPU_FAN2 on the motherboard (SYSFANIN on HWM), this connects via Swiftech 8fan PWM splitter. Now the CPU fan totally different, its Thermalright TY150, its range is 500-1100rpm, but since its the cpu fan, and personally since its inisde the case, i cant hear it much, i left it to roam freely, i setup a minium of 37.5% as the minimim PWM control and max of 100%, this gives 525-1100rpm range, so practically it can reach it if the conditions ask for. What i do like a lot is that MSI placed 2x true pwm fans, and both are independently controllable from bios, so it work perfect for my setup, as i have case fans on one and CPU fan on the other.
Quote:
Originally Posted by doyll View Post

Appears the faster the case fans ran the slower the CPU fans ran with case and cpu temps remaining relatively constant... +/-1.5c. ??
This is proportinal, as the PWM control is binded to the CPU temp, so if the case fans get more fresh air in, the max core temp is maintain lower, thus making the cpu fan spin slightly slower, so its practically the linear inclination of the PWM graph, i bet if i lower the fan and reach 80C i would reach very close to 1100rpm which is the max of the TY150.

But for me MSI has deliver a wonderful fan control on pure bios, really cant ask for more... well maybe more pwm fans headers, but 2 is good enough for me.
.
Edited by Abula - 9/30/13 at 2:23pm
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GameMi
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Intel Xeon E3-1230 SUPERMICRO MBD-X9SCM-F-O Matrox G200eW Kingston 4GB ECC DDR3 1333 
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8x Hitachi 5K3000 2TB + 6x Samsung HD154UI 1.5TB Thermalright AXP-140 WHSv1 Antec CP-850 
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Antec 1200 + 4x Cooler Master 4 in 3 2x Intel SASUC8I 
CPUMotherboardGraphicsRAM
Intel Core i3-2100T Intel DH61DLB3 Intel HD2000 Kingston HyperX LoVo 4GB DDR1333 
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post #18 of 18
I agree with you Abula.

I am using an R2 modified to use 140mm front fan, bottom vent and PSU grills removed and rear vent grill removed. I raised case (removed stock feet and built a 18mm thick open base w/ 40mm casters. Raising case increased airflow and lowered noise (less restrictive airflow). My case fans are all TY-140 spaced 6mm from filters. Front fans are 20mm away from HDD cage. When HDD cage was 15mm away the fans were much noisier.
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