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MP 6,1 Mac Pro 6,1 - 12core /D700 flicker issue

chkwong said:
The flickers issue still exists in macOS Big Sur
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I think GoodGuy12345 is right. This isn’t an issue with the cards or the software, but rather damage to the GPUs caused by overheating. So unfortunately you will need to replace the GPUs to fix the issue. Of course schedule an appointment with the Genius Bar at the Apple store so they can make the evaluation. Make sure you don’t overheat the new ones. Keep them cool by using one of the 3rd party apps to control the fan.
 
MisterAndrew said:
I think GoodGuy12345 is right. This isn’t an issue with the cards or the software, but rather damage to the GPUs caused by overheating. So unfortunately you will need to replace the GPUs to fix the issue. Of course schedule an appointment with the Genius Bar at the Apple store so they can make the evaluation. Make sure you don’t overheat the new ones. Keep them cool by using one of the 3rd party apps to control the fan.
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But when I downgrade to High Sierra, there is no flickers issue.

And when second display plugs into HDMI, there is no flickers too.

so I think it is still a driver problem?
 
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MisterAndrew said:
I think GoodGuy12345 is right. This isn’t an issue with the cards or the software, but rather damage to the GPUs caused by overheating. So unfortunately you will need to replace the GPUs to fix the issue. Of course schedule an appointment with the Genius Bar at the Apple store so they can make the evaluation. Make sure you don’t overheat the new ones. Keep them cool by using one of the 3rd party apps to control the fan.
Click to expand...

if it's an hardware fault maybe it has to show also in 10.15.0 and 10.14.0... but it started from .1 of both. No problem at all in High Sierra.
 
I haven’t experienced the issue on either of my new D500 or D700 machines in Mojave or Catalina. If it was a software problem it would be happening with all of them.
 
MisterAndrew said:
I haven’t experienced the issue on either of my new D500 or D700 machines in Mojave or Catalina. If it was a software problem it would be happening with all of them.
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What is the manufacturing date of your D500 or D700 machines?
 
I think plugging in the hdmi port probably triggers DisplayPort to boost the Signal voltage (pre-emphasis). I have the FirePro cards and the more ports you use the less stable it gets.
 
rkuo said:
I think plugging in the hdmi port probably triggers DisplayPort to boost the Signal voltage (pre-emphasis). I have the FirePro cards and the more ports you use the less stable it gets.
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Interesting to know that
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rkuo said:
I think plugging in the hdmi port probably triggers DisplayPort to boost the Signal voltage (pre-emphasis). I have the FirePro cards and the more ports you use the less stable it gets.
Click to expand...


I think you are right
when I stress the Card B using geekbench5, the flicker issue is gone during the stress test too
 
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I am a bit confused right now. So for the users, that are experiencing the issues, with the latest Mojave-Updates there are no problems, right? Or do I have to go back to High Sierra?
 
photomek said:
I am a bit confused right now. So for the users, that are experiencing the issues, with the latest Mojave-Updates there are no problems, right? Or do I have to go back to High Sierra?
Click to expand...

Have to go back to High Sierra

Mojave, Catalina, big sur have flicker issue
 
chkwong said:
What is the manufacturing date of your D500 or D700 machines?
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2014 (D500; It remained unsold at the local university until I bought it this year) and 2017 (D700).
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I'm thinking you could solve the issue by replacing only GPU 2 (graphics board B) since that's the one that drives the display. Of course the Apple store Genius Bar advisor would need to make the determination.
 
MisterAndrew said:
2014 (D500; It remained unsold at the local university until I bought it this year) and 2017 (D700).
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I'm thinking you could solve the issue by replacing only GPU 2 (graphics board B) since that's the one that drives the display. Of course the Apple store Genius Bar advisor would need to make the determination.
Click to expand...

thanks for info

my machine D700 manufacturing date is 2013


replacement is super expensive and the flicker is not fatal problem, may keep it
 
chkwong said:
thanks for info

my machine D700 manufacturing date is 2013


replacement is super expensive and the flicker is not fatal problem, may keep it
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Have you gotten a quote from the Apple store? I know replacements are expensive via 3rd party vendors, but I don’t think Apple charges that much for a repair.
 
MisterAndrew said:
Have you gotten a quote from the Apple store? I know replacements are expensive via 3rd party vendors, but I don’t think Apple charges that much for a repair.
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replace both D700 cards in official Apple , Quote around HKD $4500
 
chkwong said:
replace both D700 cards in official Apple , Quote around HKD $4500
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It looks like that is about $580 USD. That is a very good price. The parts alone from a 3rd party supplier are about $2000 USD, or HKD $15500. I believe Apple would include new GPUs, new thermal pads, and thermal grease. And of course warrantied installation utilizing their special tools.
 
As I'm experiencing this flickering also (although very lightly) I was reading through this mail thread and saw the remark about switching from DP to HDMI. I just did that and it seems that the flickering is gone. I experienced slight flickering of the right side of my screen (Lenovo ThinkVision Pro2840). I'm using a second hand 6-core 2013 trashcan system with d500 cards. Must say that quite recently I started to experience some sort of screen refreshes where the entire screen briefly turned pitch black. These refreshes were getting more frequent and the duration of the black-out went from 0,5 second to 2 - 3 seconds.
I will do some more testing if just switching to HDMI has completely resolved the issue. Will come back with an update in 1 or 2 weeks.
 
This won't always fix the issue, but if you're using Chrome on a Mac Pro 6,1, you should go into Chrome Settings > Advanced Settings and turn "Use Hardware Acceleration When Available" to OFF.
 
I just stumpled on this:
forums.macrumors.com

Graphical Glitches Plaguing Some 2020 iMac Owners With Radeon Pro 5700 XT GPU

Apple in August refreshed the 2020 iMac lineup with a new 27-inch model that's equipped with 10th-generation Intel processors, more RAM, more SSD settings, and faster AMD GPUs. Unfortunately, some new Mac owners have been running into problems with their machines and have been reporting...
forums.macrumors.com forums.macrumors.com

So I am convinced even more now that this is a driver issue only.
 
photomek said:
I just stumpled on this:
forums.macrumors.com

Graphical Glitches Plaguing Some 2020 iMac Owners With Radeon Pro 5700 XT GPU

Apple in August refreshed the 2020 iMac lineup with a new 27-inch model that's equipped with 10th-generation Intel processors, more RAM, more SSD settings, and faster AMD GPUs. Unfortunately, some new Mac owners have been running into problems with their machines and have been reporting...
forums.macrumors.com forums.macrumors.com

So I am convinced even more now that this is a driver issue only.
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Yes
Definitely driver issue

there is no problem in high sierra
 
Had the flicker. Just got the other GPU replaced (have now replaced both since getting the machine three years ago) and most of the cabling/daughter cards. No flicker.

Drivers may be part of the problem, or all the problem for some people, but there is (or will be) hardware damage related to this issue.
 
gnomeisland said:
Had the flicker. Just got the other GPU replaced (have now replaced both since getting the machine three years ago) and most of the cabling/daughter cards. No flicker.

Drivers may be part of the problem, or all the problem for some people, but there is (or will be) hardware damage related to this issue.
Click to expand...

what GPU are you using? D500 or D700?
No flicker after replacement? maybe both firmware and hardware problem, seems no other solution beside replacement
 
axantas said:
...
The temporary solution which worked immediately: Run the display at 50 instead of 60Hz. There is a Utility for Mac to override the fact, that you cannot choose 50Hz.
No idea, whether this is of any help for your machine, but I got rid of all problems at 50Hz.
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I never used a 4k display. But...
What Utility did you use?
Thank you
 
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