2 fans, 1 cha_fan input on Asus m5a97 r2.0

Jakubek89 · Dec 4, 2016

Hi guys....yes I know - title recall something nasty that you can find on the internet

Nevertheless I have real questions to you. My mobo, like I wrote is Asus m5a97 r2.0 -
1 x CPU Fan connector(s) (4 -pin)
3 x Chassis Fan connector(s) (4 -pin)

For now I have all fan inputs used. I need to exchange mine CPU (AMD FX 8320) box cooling for somethinng much more efficient, as I would like to OC this to 4,2 ghz. I already OC CPU, but temps jumped over 65 C almost immediately after I launched primie95, which caused system crash - even small OC cause temp issue. Therefore I want to Buy CPU SilentiumPC Fera 3 HE1224 v2 and add additional fan. Unfortunately I don`t have free fan input.

My questions are:
1. Can i use something like this: http://www.komputronik.pl/product/90868/Sprzet_komputerowy_/Podzespoly/AAB_Cooling_AAB_C19.html to connect two mounted on Fera fans and plug it to CPU_FAN input on Mobo and it will not fried it? If Mobo won`t fried, the system will be able to control both fans rpms?

2. Second option is that I plug fera fans to CPU_Fan input on Mobo, and second fan on Fera will be connected with chasis fan with this "special" cable....and both will be plugged to Cha_Fan input. But...to be honest... questions are the same....Will it be safe for fan input and will I be able to use systems rpm control.

In theory in manual of my mobo is information: CPU Fan connector support CPU fan maximum 1A(12W) fans power. I think that 120 mm fans like this: Arctic F12 PWM Rev. 2 need about 0,3A (?) ...so connecting 2 fans like this to one mono input should be safe?

thanks for help

p.s. sorry for mistakes - English is not my native language.

Aeacus · Dec 7, 2016

Rather than going with SilentiumPC CPU cooler, you can go with Arctic Freezer A32 instead.
specs: https://www.arctic.ac/eu_en/freezer-a32.html
pcpp: http://pcpartpicker.com/product/bF8H99/arctic-cooling-cpu-cooler-acfre00005a

Just get the Arctic F12 PWM PST and mount it to the CPU cooler to achieve push-pull configuration.
(I've done so in my Skylake build, specs in my signature. But since my build is Intel, i'm using Arctic Freezer i32.)

As far as fan connecting goes, if you get the Arctic F12 PWM PST then it has the Y-splitter where you can connect your CPU cooler fan. And then connect it to the CPU_FAN connector. You can control the fan RPMs but do note that both fans do run in sync. Can't control them separately when both are using the same CPU_FAN connector.

Same goes when you get the SilentiumPC CPU cooler and use the Y-splitter you linked to connect both CPU cooler fans to the CPU_FAN connector. Controlling them is same, both fans run in sync.

Jakubek89 · Dec 8, 2016

Aeacus :

okay, but is it safe for motherboard and CPU_FAN connecter to plug in two fans with one plug? There will be two times higher voltage? Well, it says on the label that PST fan need 0,24a:
https://static.arctic.ac/media/catalog/product/f/1/f12_pwm_pst_co_g05_1.jpg
, and extra fan for pulling the air will be similar , so in total 0,48A....the questions is, are those fans may take much higher voltage from source: MOBO in my case...when CPU will be fully loaded?

Aeacus :

Moreover I learned that I will be able to fit into my housing, Fortis 3 v2 cooler:
https://www.morele.net/chlodzenie-cpu-silentiumpc-fortis-3-he1425-v2-spc130-707501/?tech_page=2 .

Therefore I am wondering which solutions will be better and more efficient :

1. SilentiumPC Fortis 3 HE1425 v2 with one cooler. This cooler is quite big, so on the back of my housing is one fan already (which is pulling the air out of housing). So we might say it is close to push-pull config - but there will be space between fan (pulling) and CPU radiator

or

2. SilentiumPC Fera 3 HE1224 v2 with two fans (push - pull config) plugged in one CPU_FAN connector on MOBO? If I understang correclty I can use arctic fan with this PST solution, and second one normal fan which is: https://www.morele.net/arctic-f12-pwm-rev-2-afaco-120p2-gba01-622366/ ??

Aeacus · Dec 8, 2016

MoBo can handle two fans connected on a single fan connector. Even when CPU is at 100% load and it's two heatsink fans also run at 100%, the load on MoBo fan connector isn't too much. Though, i don't suggest plugging 3 fans on a single MoBo fan connector.

The ampere rated on fan is the maximum power draw when fan is running 100%. If one fan uses 0.24A then two same fans use total of 0.48A and no more. But fans do use less when they don't spin 100%.

Option 1. doesn't achieve the true push-pull configuration on CPU cooler and therefore doesn't cool the CPU as efficiently as 2 fans mounted on CPU heatsink.

Option 2. would be the best solution, despite the seemingly narrow space between 2nd CPU heatsink fan and rear exhaust fan.

Here's a picture of my Skylake build when it was in my AMD's case before my new Corsair 760T (full-tower) case arrived.
(Click on image for full size view.)

From the image you can see the Arctic Freezer i32 set up with the 2nd 120mm Arctic F12 PWM PST fan in push-pull configuration.
On my MoBo, i have 5 fan connectors: CPU_FAN1, CPU_FAN2, SYS_FAN1, SYS_FAN2 and SYS_FAN3. At that time, i had both of my CPU heatsink fans connected to the CPU_FAN1 connector so, that both fans will run in sync and create fluid air flow through the heatsink.
If the fans wouldn't run in sync, you can have air disturbance inside the heatsink and you'd loose cooling performance due to that.

Jakubek89 · Dec 8, 2016

okay than. I Think that this solves my problem! Thanks a lot for help!

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