AMD Motherboards - Available power on PWM headers£

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Available power on PWM headers£

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=23388
Printed Date: 19 Mar 2025 at 12:51am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Available power on PWM headers£

Posted By: BerMM
Subject: Available power on PWM headers£
Date Posted: 29 Mar 2022 at 10:09am

How much can I safely draw from each PWM header on the B550 Taichi? I'd like to use a pair of 0.55A fans and four 0.3A fans.

Replies:

Posted By: threadzipper1957
Date Posted: 08 Aug 2022 at 6:34pm

4 Pin fan header usually provides 1A.
But if I were you, I would not connect so many fabns to one header, there is a good chance, you burn out the fan controller chip.
Fans always have a longer life span, when they run on a fixed speed, just connect the to a Molex from the PSU, and use a resistor cable, also you can then use a splitter cable.
Multiple fanbs, on one header, is never a good idea.

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Kind Regards

Posted By: BerMM
Date Posted: 09 Aug 2022 at 1:00am

Thanks. I should clarify. I have 3 pairs of fans, with each pair on its own header. The most power hungry pair is 1.1 amp total with the others at 0.6 amp per header. I could split the 1.1 amp pair to 0.55 amp per header if necessary.