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How many amps can the P8P67 Pro handle on its fan headers?

post #1 of 17
Thread Starter 
How many amps can the P8P67 Pro handle on its fan headers?
Answered.

And can they handle this:
Quote:
Originally Posted by nawon72 View Post
Here are the possible combination of fans i will be using, and their amperage:

CHA_FAN1
-------------------------------------------
1.426A all fans(not CPU related) + exhaust fan + top vrm fan

1.246A all fans(not CPU related) + exhaust fan

1.123A all fans(not CPU related)


CHA_FAN2
-------------------------------------------
0.989A all fans(CPU related)

0.809A no top vrm fan

0.866A no exhaust fan

0.686A no exhaust fan + no top vrm fan


CPU_FAN
-------------------------------------------
0.18A top vrm fan


Please tell me which combinations would be safe to use.

Edited by nawon72 - 8/23/11 at 3:02pm
post #2 of 17
Quote:
Originally Posted by nawon72 View Post
How many amps can the P8P67 Pro handle on its fan headers?
According to the motherboard manual (page 2-27), the CPU_FAN header supports up to 1A (12W).

For PWR_FAN1, the max is 24W (according to Asus Forum moderator Ulrich. So, 24W/12V = 2A.
http://vip.asus.com/forum/view.aspx?...Language=en-us)

For CHA_FAN1 and CHA_FAN2, it is either the same 24W or 12W. So, it is safe to use the 1A (12W) which is quite a lot already.
Edited by windfire - 8/18/11 at 8:54pm
post #3 of 17
Thread Starter 
Quote:
Originally Posted by windfire View Post
According to the motherboard manual (page 2-27), the CPU_FAN header supports up to 1A (12W).

For PWR_FAN1, the max is 24W (according to Asus Forum moderator Ulrich. So, 24W/12V = 2A.
http://vip.asus.com/forum/view.aspx?...Language=en-us)

For CHA_FAN1 and CHA_FAN2, it is either the same 24W or 12W. So, it is safe to use the 1A (12W) which is quite a lot already.
Thanks for your help

I mostly wanted to know how many Amps the CHA_FAN1 and CHA_FAN2 fan headers can handle(they have voltage control). I'm thinking of putting around 1.25A of fans on one the the fan headers so i can avoid buying a fan controller
post #4 of 17
Quote:
Originally Posted by nawon72 View Post
Thanks for your help

I mostly wanted to know how many Amps the CHA_FAN1 and CHA_FAN2 fan headers can handle(they have voltage control). I'm thinking of putting around 1.25A of fans on one the the fan headers so i can avoid buying a fan controller
Notice CHA_FAN1 and CHA_FAN2 do not provide the same voltage. FAN1 provides 5v while FAN2 provides 12v. See pic below.

I suspect the 24W is the max (considering the extra voltage during spin-up) while 12W is perhaps the working figure.
This means, using 12W as a working figure and being conservative, FAN1 can deliver 12/5=2.4A while FAN2 delivers 12/12=1A.

As your fans only total 1.25A, both headers can accommodate them easily.
post #5 of 17
Which fan headers will turn the fans up and down automatically via temperature on the CPu though? I'm curious as well, because I've got 2x 0.8a Delta's I'd like to run off mine.
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post #6 of 17
Quote:
Originally Posted by pioneerisloud View Post
Which fan headers will turn the fans up and down automatically via temperature on the CPu though? I'm curious as well, because I've got 2x 0.8a Delta's I'd like to run off mine.
Usually the 4-pin CPU_FAN header will do this job nicely.
post #7 of 17
Quote:
Originally Posted by windfire View Post
Usually the 4-pin CPU_FAN header will do this job nicely.
Even though its only technically rated at 1.0a? And I plan to run what, 1.6a worth of fans off it?
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post #8 of 17
Quote:
Originally Posted by pioneerisloud View Post
Even though its only technically rated at 1.0a? And I plan to run what, 1.6a worth of fans off it?
It depends on the motherboard. The CPU_FAN header of some higher end motherboards delivers 2A.

If your mobo is the same as OP's, then obviously 1.6A > 1A and it should not work.
post #9 of 17
Quote:
Originally Posted by windfire View Post
It depends on the motherboard. The CPU_FAN header of some higher end motherboards delivers 2A.

If your mobo is the same as OP's, then obviously 1.6A > 1A and it should not work.
Yup, same board. Sigh, guess I'll just leave it be then, unless there's another fan header that can adjust fan speeds based off CPU temps.
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post #10 of 17
Thread Starter 
Quote:
Originally Posted by pioneerisloud View Post
Yup, same board. Sigh, guess I'll just leave it be then, unless there's another fan header that can adjust fan speeds based off CPU temps.
You can use your Delta's on the CHA_FAN1 and CHA_FAN2 fan headers, or both on CHA_FAN1. I'm using both of them to control my AP181's via the AI Suite II. The only problem with using those fan headers is that you can only lower the fan speed to 40% via AI Suite II, and in the BIOS its 60%. Another possible problem is that CHA_FAN1 runs the fan at about 50rpm higher, but it could just be my fans. And yes, it does change speed based off CPU temp.

Oh, and make sure you set the temperature for the fan speed to change 10*C lower than usual if your on BIOS 1704 or higher. Here is a picture showing what i mean:


Edit: I forgot to mention that the CPU_FAN header can't control 3pin fans, even though the CHA_FAN headers can. I have no idea why ASUS did it this way. I know this from testing my fans on the different headers.

Quote:
Originally Posted by windfire View Post
Notice CHA_FAN1 and CHA_FAN2 do not provide the same voltage. FAN1 provides 5v while FAN2 provides 12v. See pic below.

I suspect the 24W is the max (considering the extra voltage during spin-up) while 12W is perhaps the working figure.
This means, using 12W as a working figure and being conservative, FAN1 can deliver 12/5=2.4A while FAN2 delivers 12/12=1A.

As your fans only total 1.25A, both headers can accommodate them easily.
Sorry if this is a noob question, but will the CHA_FAN1 header still support 2.4A if i'm using 3pin fans?
Edited by nawon72 - 8/19/11 at 1:01am
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