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Why do CPU fans start to spin at full speed while doing a bios update?

Hello,

Whenever I do an bios update on a laptop or desktop. I notice the cpu fan always starts to spin at full speed. Why does it do this? Is bios flashing cpu intensive?

Thanks if anybody knows why 馃檪

Main PC:

CPU:聽AMD Ryzen 5聽5600X | RAM:Corsair LPX 3200 mhz聽(16Gb)聽

Mobo:ASUS Strix B550-F Wifi | GPU:聽MSI RTX 2070 Gaming Z

Case: Sharkoon Nightshark RGB| Storage: 500 GB 970 EVO Plus 1 TB WD blue 500 GB Samsung HDD

Monitor:聽iiyama G-Master G2470HSU-B1 165Hz

Powersupply: Be Quiet straight Power 10 500 watt

Main Laptop

CPU: AMD Ryzen 7 4800H | RAM: Team group 16 GB 2666 mhz

GPU: RTX 2060 (MXM swappable)

Monitor: 1080p 120Hz

Storage: 2x 1 TB Samsung 970 EVO NVMe (no raid)

Second Laptop

CPU: Intel Core I5 1235u, 聽RAM: Samsung 8 GB 3200 mhz

GPU: IrisXe 80 eu

Storage: 512 GB WD Digital SN530 NVMe

Phone:

Xiaomi MI 11

Work Phone:

Galaxy A50

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7 minutes ago, Wolly9102 said:

Hello,

Whenever I do an bios update on a laptop or desktop. I notice the cpu fan always starts to spin at full speed. Why does it do this? Is bios flashing cpu intensive?

Thanks if anybody knows why 馃檪

No, it's probably a just in case to stop it from overheating and brickintg the board.

I could use some help with this!

please, pm me if you would like to contribute to my gpu bios database (includes overclocking bios, stock bios, and upgrades to gpus via modding)

Bios database

My beautiful, but not that powerful, main PC:

prior build:

Spoiler

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How often are you updating?聽 You should only update the BIOS as a last resort when there is no other solution.聽 But, I suppose you must be pretty good at it by now, so maybe practice makes perfect.

To answer聽 your question: it is probably just because it needs to cool the CPU and all the brains of the board are concentrating on the BIOS update, so there is little processing left for thermal monitoring.

It must be true, I read it on the internet...

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6 minutes ago, shoutingsteve said:

How often are you updating?

When we recieve a new laptop to be聽prepared for an customer almost every manufacture includes them in their support software.

8 minutes ago, shoutingsteve said:

it is probably just because it needs to cool the CPU and all the brains of the board are concentrating on the BIOS update, so there is little processing left for thermal monitoring.

Ah thanks 馃檪

Main PC:

CPU:聽AMD Ryzen 5聽5600X | RAM:Corsair LPX 3200 mhz聽(16Gb)聽

Mobo:ASUS Strix B550-F Wifi | GPU:聽MSI RTX 2070 Gaming Z

Case: Sharkoon Nightshark RGB| Storage: 500 GB 970 EVO Plus 1 TB WD blue 500 GB Samsung HDD

Monitor:聽iiyama G-Master G2470HSU-B1 165Hz

Powersupply: Be Quiet straight Power 10 500 watt

Main Laptop

CPU: AMD Ryzen 7 4800H | RAM: Team group 16 GB 2666 mhz

GPU: RTX 2060 (MXM swappable)

Monitor: 1080p 120Hz

Storage: 2x 1 TB Samsung 970 EVO NVMe (no raid)

Second Laptop

CPU: Intel Core I5 1235u, 聽RAM: Samsung 8 GB 3200 mhz

GPU: IrisXe 80 eu

Storage: 512 GB WD Digital SN530 NVMe

Phone:

Xiaomi MI 11

Work Phone:

Galaxy A50

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Probably goes into potato mode and instead of pwm mode they just run basic on/off

Before you reply to my post, REFRESH. 99.99% chance I edited my post.聽

My System: i7-13700KF聽// Corsair iCUE H150i Elite Capellix聽// MSI MPG Z690 Edge Wifi聽// 32GB DDR5 G. SKILL RIPJAWS S5 6000 CL32聽//聽Nvidia RTX 4070 Super FE聽//聽Corsair 5000D Airflow聽// Corsair SP120 RGB Pro x7聽//聽Seasonic Focus Plus Gold 850w //1TB ADATA XPG SX8200 Pro/1TB Teamgroup MP33/2TB Seagate 7200RPM Hard Drive聽//聽Displays: LG Ultragear聽32GP83B x2//聽Royal Kludge RK100 // Logitech G Pro X Superlight // Sennheiser DROP PC38x

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When updating the BIOS it cannot controll the FAN speeds. So it reverts back to a safe default, which is fullspeed. (altho in reality its more like 85-90%)

When i ask for more specs, don't expect me to know the answer!
I'm just helping YOU to help YOURSELF!
(The more info you give the easier it is for others to help you out!)

Not willing to capitulate to the ignorance of the masses!

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i assume that during an update, the system is put to a state of absolute bare essentials. similar as it is during the first stage of booting:

- cpu locked at base clock

- all fans at 100% (because that's the safest default state)

- only outputting to a single display connector

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