SAPPHIRE PULSE Radeon™ RX Vega56 8G HBM2 Wrong FAN RPM

Teral

Member
[font=arial,sans-serif]On sreenshot:[/font]
[font=arial,sans-serif]Black arrows start the fans[/font]
[font=arial,sans-serif]Blue arrows fans turned off[/font]
[font=arial,sans-serif]The red arrow is abnormally high, the fans are off (I think such high rpm, above 1700 should also be ignored)[/font]
 

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Martin

HWiNFO Author
Staff member
Hm, that looks like ~1800 RPM also indicates off.. That's not good, no single/simple level that would provide an accurate indication.
 

Teral

Member
This is madness...
I made many attempts to trace the dependence of the FAN RPM sensor and the start / stop of the fans.
after stopping the fan, the sensor sometimes shows high value it is (1715 rpm), but it can show a value between 1350 ... 1700 rpm
So either wait for the fix in the AMD or VGA BIOS drivers, or apply a more complicated algorithm for calculating the fan stop.

I noticed that when the fan is off, the rpm values are always the same (for example 1361, 1361, 1361 ... etc.)
And when they spin, they jump at least 1. (for example 1451, 1450, 1451, 1452 ... etc.)

Also it turns out it is necessary to compare last (three or four) values of rpm, and if they are equal that this value to consider "0" yet will not change.
I hope I could explain with my bad english.
 

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Martin

HWiNFO Author
Staff member
Thanks for the extensive testing, I understand it very well.
Are you sure that when the fan is spinning the reported speed is not constant?
 

Teral

Member
Yes, I played for several hours in different games, the values for a spinning fan slightly change (maximum I saw three identical values when the fan was spinning, ex. 1430, 1421, 1421, 1421, 1402, 1416)
For more reliability, I can activate the log in HWiNFO and send the result to you. With marks when fans were switched on and off.

Today is a cold morning And the fans rotated at a low speed from 600 to 1300 rpm.
 

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Martin

HWiNFO Author
Staff member
Thanks for the results.
Please try this build and let me know how it works: www.hwinfo.com/beta/hwi64_583_3415.zip
HWiNFO should now report 0 RPM if the last 4 fan speed samples were same. This change will work for Sapphire Vega GPUs only to avoid false reporting on other GPUs.
 

Teral

Member
It works :)
A little later, I will spend more tests in games.
But it seems to me that this is the best solution, until AMD or Sapphire fix it in the driver or BIOS, if they fix it.
 

Teral

Member
Good news to everyone
AMD in the new drivers (18.4.1) fixed fan monitoring on Vega.
 

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Martin

HWiNFO Author
Staff member
Thanks for the feedback. Does it mean that the patch I implemented is no longer needed ?
 

Teral

Member
Sorry for the long silence, there were holidays :)

Strange, does not work
But MSI Afterburner and AMD drivers began to show 0 RPM when the fans are off
 

Teral

Member
Oh. Sorry, I hurried.

Yes, he appeared. And it works well.
 

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Martin

HWiNFO Author
Staff member
Thanks for the feedback. Not appearing of the fan after startup when the fan is not spinning will be fixed in the next build.
 

Teral

Member
[font=arial,sans-serif]It's me again :)[/font]
[font=arial,sans-serif]Probably a little offtopic.[/font]
[font=arial,sans-serif]I noticed that the VRM temperature sensors are disappearing[/font]
 

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