Advice sought : How to set multiple PWM fans (Vipers) to run off CPU header ?

Soldato
Joined
18 Jun 2005
Posts
3,434
Just a query.

I am using 5 Akasa Viper fans, and they are all running off my CPU header on my motherboard. They are all mounted on the top of my 800D - 4 of them are in push/pull with an ECO 240, the other is by itself.

Was wondering if this is the best way to run them off 1 header.

2 cables :
1. Akasa PWM which lets you power 3 fans and power from psu molex.
http://www.akasa.com.tw/update.php?...es&type_sub=Fan Cable Adapters&model=AK-CB002

2. Phobya Y-cable 4Pin PWM to 3x 4Pin PWM. Same idea as Akasa cable but no molex power.

[Both cables take only have rpm sensing 4pin connector]

In short :
Akasa 4pin input<--phobya cpu 4pin output-->fan1 4pin,fan2,fan3
Akasa 3pin input<-- fan4
Akasa 3pin input<--fan5
Akasa cpu 4pin output-->motherboard header
Akasa 4pin molex output-->psu

What I've done is plug 3 Viper fans from the rad into the phobya cable (so the 1st fan has it's rpm detected as it's plugged into the 4pin input and the rpm from that is passed to the other 2 fans). I then plugged the 4pin CPU output of the phobya cable into the 1st 4pin connector of the Akasa cable which reads the rpm output as a single fan. And the remaining 2 vipers are plugged into the last 2 3pin connectors on the Akasa cable and have their rpm passed to them from the 1st connector which is running 3 fans. Finally the molex goes into the psu and the cpu output goes into the motherboard header.


Is there a better way to do this ?
 
Can't you use 2 Akasa cables together?

So, Header > Fan1/Fan2/Akasa > fan3/fan4/fan5 ?

Edit: Don't know if this is better but it is what I would try.
 
I could if I had a 2nd one. Might give it a go. Seems to be working though. Just wondering if my setup is the reason there is pwm ticking noise on my Vipers. Then again when I was using the Akasa cable with just 3 fans as intended it was the same story with this ticking noise on the Apache fans. Anyway, I'll order another Akasa cable and try your suggestion. The only difference I can see is that both cables would be receiving power seperately.
 
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