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

Teral

Member
Wrong GPU Fan RPM on SAPPHIRE PULSE Radeon™ RX Vega56 8G HBM2 
RPM = 0, but HWiNFO say 1350RPM
 

Attachments

Martin

HWiNFO Author
Staff member
Please attach the HWiNFO Debug File of situation with RPM=0 and I will check that.
 

Martin

HWiNFO Author
Staff member
Thanks. Are you sure that the fan is off, or is that just GPU-Z indication?
 

Teral

Member
Yes, I checked. Fans do not rotate on the video card, but in monitoring 1351RPM
The fan starts when GPU temperature is more than 55C
 

Martin

HWiNFO Author
Staff member
Thanks for the feedback.
Yes, all AMD functions report a non-zero RPM in that case, so I'm really puzzled how does GPU-Z report this case.
Can you please try to enable the "GPU I2C Support Force" option in HWiNFO and then create a Debug File? Please note that in this case there's a risk of a system crash with Vega GPUs, so be prepared for this.
 

Martin

HWiNFO Author
Staff member
Sorry, I forgot to tell you that after enabling the "GPU I2C Support Force" option, you will need to press the "Reset GPU I2C Cache" button and then start HWiNFO.
Can you please repeat the test run?
 

Teral

Member
Martin said:
Sorry, I forgot to tell you that after enabling the "GPU I2C Support Force" option, you will need to press the "Reset GPU I2C Cache" button and then start HWiNFO.
Can you please repeat the test run?
the first attempt to fail during the launch of HWiNFO, the computer hung with a black screen and noisy at maximum RPM fans on the video card - HWiNFO64-1.dbg

the second is a successful launch. But the fan RPM is wrong. - HWiNFO64-2.dbg
 

Attachments

Martin

HWiNFO Author
Staff member
Thanks for the results.
I'm sorry, but currently I have no idea how to determine fan stop in this case. It's quite possible that Sapphire uses some custom fan control mechanism about which not even AMD drivers are aware. I will keep trying to determine this, but don't have any other ideas for now...
 

Martin

HWiNFO Author
Staff member
Another theory might be that for these cards a fan speed of ~1330-1370 RPM (~40-41%) means off.
What if I would implement such filtering ?
 

Teral

Member
Martin said:
Another theory might be that for these cards a fan speed of ~1330-1370 RPM (~40-41%) means off.
What if I would implement such filtering ?
It seems to me that a similar trick is used by the GPU-Z. When it starts up, it also for a second shows 1350 rpm, but then adjusts the indicators to 0 rpm.

I open ticket in sapphire tech support, maybe they will offer a solution (for example a new version of BIOS)
 

Attachments

Martin

HWiNFO Author
Staff member
Yes, looks like that. Are you able to determine what fan speed range is reported when the fan is off? Then I could tune this more precisely.
 

Teral

Member
I saved the sensor log from the GPU-Z.
I think it checks a few seconds if the rpm does not go beyond the range 1362..1700 then it reports rpm = 0
 

Attachments

Martin

HWiNFO Author
Staff member
Based on the data you provided so far, I think that a reasonable filter would be that if 1330 <= RPM <= 1370, then it's off.
Are you able to compare HWiNFO fan readouts when the fan is really off (not just off reported by GPU-Z) and confirm this ?
 
Top