PWM not working

[Adrian__]

I have recently built my first PC and I am having issues with my pre-installed Aer F fans, When PWM is selected in BIOS, the fans will spin up to their max RPM and cannot be changed, despite the fact that NZXT says they support PWM and the connectors are 4-pin. DC does work for changing RPM.

 

PC in question: https://pcpartpicker.com/list/KDQPD2

[Wolly9102]

Can you repost the list? Can't see it

[Adrian__]

[PCPartPicker part list](https://pcpartpicker.com/list/KDQPD2) / [Price breakdown by merchant](https://pcpartpicker.com/list/KDQPD2/by_merchant/)

Type|Item|Price
:----|:----|:----
**CPU** | [AMD - Ryzen 5 2600 3.4 GHz 6-Core Processor](https://pcpartpicker.com/product/jLF48d/amd-ryzen-5-2600-34ghz-6-core-processor-yd2600bbafbox) | $164.99 @ Amazon 
**Motherboard** | [MSI - B450 TOMAHAWK ATX AM4 Motherboard](https://pcpartpicker.com/product/Hy97YJ/msi-b450-tomahawk-atx-am4-motherboard-b450-tomahawk) | $114.99 @ B&H 
**Memory** | [Corsair - Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory](https://pcpartpicker.com/product/MYH48d/corsair-memory-cmk16gx4m2b3000c15) | $104.99 @ Amazon 
**Storage** | [Kingston - A400 240 GB 2.5" Solid State Drive](https://pcpartpicker.com/product/btDzK8/kingston-a400-240gb-25-solid-state-drive-sa400s37240g) | $29.99 @ Amazon 
**Video Card** | [MSI - Radeon RX 570 8 GB ARMOR OC Video Card](https://pcpartpicker.com/product/3JdFf7/msi-radeon-rx-570-8gb-armor-oc-video-card-rx-570-armor-8g-oc) | $179.99 @ Newegg 
**Case** | [NZXT - H500 (Black) ATX Mid Tower Case](https://pcpartpicker.com/product/p8x2FT/nzxt-h500-black-atx-mid-tower-case-ca-h500b-b1) | $69.99 @ Amazon 
**Power Supply** | [Corsair - CXM 550 W 80+ Bronze Certified Semi-Modular ATX Power Supply](https://pcpartpicker.com/product/3hkwrH/corsair-power-supply-cp9020102na) | $59.99 @ Amazon 
 | *Prices include shipping, taxes, rebates, and discounts* |
 | **Total** | **$724.93**
 | Generated by [PCPartPicker](https://pcpartpicker.com) 2019-02-23 18:16 EST-0500 |

[Bartholomew]

12 hours ago, Adrian__ said:

I have recently built my first PC and I am having issues with my pre-installed Aer F fans, When PWM is selected in BIOS, the fans will spin up to their max RPM and cannot be changed, despite the fact that NZXT says they support PWM and the connectors are 4-pin. DC does work for changing RPM.

 

PC in question: https://pcpartpicker.com/list/KDQPD2

Hmm thats indeed odd; those fans are listed as pwm ones alright.

 

I recently happen to have read this: https://forum-en.msi.com/index.php?topic=291919.0

 

Different model tomahawk and slightly different issue but is indicative of some msi bios code being flaky with pwm fans.

So best bet at this time would be to check if there is a bios update available.