AMD Motherboards - X399 Pro Fan adjustment Slow/No MAX speed

X399 Pro Fan adjustment Slow/No MAX speed

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=7575
Printed Date: 01 Mar 2025 at 5:18pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: X399 Pro Fan adjustment Slow/No MAX speed

Posted By: NorySS
Subject: X399 Pro Fan adjustment Slow/No MAX speed
Date Posted: 05 Feb 2018 at 7:12am

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CPU: 1950X

CPU Cooler: Enermax TR4 280mm

Mobo: x399 Fatal1ty Bios 2.0

RAM : 32GB Corsair

GPU: Titan Xp

NVME Drives: 500GB 960 Evo (x2), 512GB 960 Pro (x1)

Has anyone noticed an issue with FANs slow to adjust, or not reaching their 'highest' RPM?

Here was my issue, I was trying to overclock my 1950X to 4.0GHz, but i would immediately lock up due to temps. I would run prime95, the CPU temps would climb to 70+ degrees,. before the fans/pump RPMs would start to climb. The Pump, and FANs were slow to react. I double checked all my settings, making sure they were monitor Die temp (actual CPU temps, not the offset).

The other Issue I noticed, was that that even though I was commanding 100%, the pumps and fans would not reach it. I made sure they were all set in the BIOS to 100% at 60C. No Dice. But if I set the 'fan mode' to max' they would go to the maximum rpm.

For Instance:

Enermax Pump:

PWM setting @ 100%: 2400RPMs
MAX Setting: 2800RPMs

These two issues combined, would not allow me to stabilize my system during a stress test. It was so bad, that I had to go out and buy a Corsair Commander Pro to alleviate the situation.

Now my system is at 4.1GHz while playing PUBG thanks to the commander Pro.

Replies:

Posted By: kerberos_20
Date Posted: 05 Feb 2018 at 7:49pm

" rel="nofollow - u really think that 400 rpm on fans will make any diff?
try to touch your radiator and youll see what i mean.
i run aio fans on 900rpm, cpu sits in 30~45degrees at 4.1ghz all cores

btw pretty much every enermax pump should be running at max speed in dc (3 pin) mode
unless u have neochanger? but that one has sata connector...

Posted By: NorySS
Date Posted: 06 Feb 2018 at 2:16am

" rel="nofollow - [URL=][/URL]You are right, it should be running at max when max voltage is applied. I didn't make myself clear, I'm sorry for the confusion. THE ENERMAX AIO was set to voltage control for the pump.

And the fans are set to PWM.

Yet neither reach their max rpms. Add that issue to the slow reaction and you hit thermal tjmax.

Also what cpu are you running at 4.1Ghz, at such low temps? Nvm, just saw you are running a 1600x.

Theres a 10 core difference. Obviously heat is an even bigger issue on the 1950x @ 4.1ghz than a 1600x. But thanks for pointing out the issue of my settings.