HP EliteDesk 800 G4 Mini PC (with RX560) fan problem

[g4nasko]

Hello,

have an HP EliteDesk 800 G4 Mini PC with RX560 upgrade. On boot the graphics card fan starts working same as  CPU fan. Both of them start spinning then stop then start again. When the BIOS is loaded the graphics card fan stops and then does not work even when the card is getting hot above 70 deg.

Any suggestion will be appreciated

[erico]

I suggest upgrading the AMD Radeon RX560 video card since the fan on the video card is controlled by the video card BIOS ROM coding.

[g4nasko]

Thank you for the suggestion. I tried latest driver for windows without luck.
Any suggestions where to look for VBIOS?
I can't find nothing on AMD site.

[erico]

What is the brand of your RX560 GPU?  

The different brands usually have a vBIOS firmware update?

Here is a search that I did for that in a generic sense. For your card it will depend on the manufacturer.

https://www.google.com/search?client=firefox-b-1-d&q=amd+radeon+rx+560+bios+update#ip=1

Remember that with every BIOS or in this case vBIOS comes an element of risk.

[g4nasko]

My card is original HP graphic card. Bought it brand new.
Reinstalled drives from AMD to no avail.
Strange thing is the fan is working until the bios is loading and stops afterward.
After watching some videos and some CAD work the GPU is overheating and the system shuts down.
The temporary fix now I made is to install a 5V fan connected to one of the USB ports and blowing over the GPU. The GPU is running cool but it's an ugly solution. If I can't solve this by bios or driver update I will replace the GPU fan with something smaller then the one I am using now.

Or another solution is to connect the GPU fan in parallel with the CPU fan if it is possible.

[g4nasko]

I cut the PWM wire of the GPU fan. Now it runs at full speed but the noise is unpleasant.
Just for info - the wiring is:
- BLACK - GND
- RED - 12V
- YELLOW - Tach signal from fan
- BLUE - PWM signal

Maybe I will try to use the PWM signal from the CPU fan to control the GPU fan. Could have some issues when the GPU load is excessive but I think that most of the time the the CPU and the GPU are loaded somewhat synchronously.
And if someone can suggest other solution (driver or BIOS or MB settings) it will be greatly appreciated.

[g4nasko]

Found some suggestions for the cause of the problem in this post:

https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/HP-EliteDesk-800-G4-Mini-PC-wit...

The GPU fan is connected in the HDD fan socket, because GPU card is mounted in place of the SATA HDD drive.
So far I have no idea how MB controls the HDD fan.

[erico]

You should take a read of this thread regarding the same 800 G4 desktop mini that you have.

https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Upgrading-an-HP-EliteDesk-800-6...

You can use vBIOS files for any RX560 with 4GB. The BIOS  ROM files are all are based on a reference RX560 board that AMD Radeon division designs and sells to other manufacturers by granting licensing rights .  That is how and why your video card has an HP part number.

Upgrading to a more recent vBIOS may resolve the issue. There does also exist the possibility that the thermal interface material between the GPU processor and the cooling solution needs to be renewed.

[g4nasko]

This post was the reason I upgraded my HP EliteDesk 800 G4 Mini PC with RX560. But by that time I didn't know that there are different MB  - 35W/65W/90W and that only 35W be upgraded with the original HP discrete video card RX560. I went through my upgrade in this post:
https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Upgrade-HP-800-G4-MINI-35W-to-6... 

[erico]

Well, the motherboards can be bought cheap and a new Windows 11 Pro license activation code for @ $20.00.

I was not aware that you were part of another thread. It would have prepped me if I had been forearmed with that.