MP 6,1 How to test both GPU in 2013 Mac Pro

[MacZoltan]

I have a mac pro acting strange and would like to test both GPU.
Whatever I plug into any of the ports it uses only one GPU, how can I run both GPU the same time to test them?
Or how to run dual monitor one using GPU1 and the other GPU2?

 

[CC88]

I have a mac pro acting strange and would like to test both GPU.
Whatever I plug into any of the ports it uses only one GPU, how can I run both GPU the same time to test them?
Or how to run dual monitor one using GPU1 and the other GPU2?

It's not possible. Only one GPU is used for monitors. The other is for computation when needed.

I use GPU History under Activity Monitor to see how much the second one is used and when. But normally it's not used a part in FCPX on my side.

 

[chfilm]

It's not possible. Only one GPU is used for monitors. The other is for computation when needed.

I use GPU History under Activity Monitor to see how much the second one is used and when. But normally it's not used a part in FCPX on my side.

Normally it‘s not used anywhere for me sadly :/ Seems like a real waste and it‘s a good reminder of what setup to get in the tMP!

 

[vett93]

One GPU for displaying images to monitors and one GPU for processing. Isn't this a good idea? With the Catalina OS, the 2nd slot GPU seems to be more active than before.

 

[CC88]

One GPU for displaying images to monitors and one GPU for processing. Isn't this a good idea? With the Catalina OS, the 2nd slot GPU seems to be more active than before.
View attachment 878459

The 2nd slot GPU is the one used for monitor. It's the same in Mojave and HS and so on.

 

[vett93]

The 2nd slot GPU is the one used for monitor. It's the same in Mojave and HS and so on.

It appears that the 2nd slot GPU is used for processing in my system running Catalina.

 

[vett93]

The above may be a bug in Mac OSX software. According to the System Information panel, the monitors are connected to Slot-2 of the GPU cards. However, the above Activity Monitor showed the opposit.

 

[CC88]

The above may be a bug in Mac OSX software. According to the System Information panel, the monitors are connected to Slot-2 of the GPU cards. However, the above Activity Monitor showed the opposit.
View attachment 878569

Monitor via hdmi, thunderbolt etc are from slot2 this is why you see LR,Topaz,istat in slot2.

Slot1 is used for processing as you can see Topaz is the only process in slot1 that use gpu processing.

 

[vett93]

Monitor via hdmi, thunderbolt etc are from slot2 this is why you see LR,Topaz,istat in slot2.

Slot1 is used for processing as you can see Topaz is the only process in slot1 that use gpu processing.

If you look at the chart, the GPU in Slot 2 was the one that had a high CPU level when Topaz was performing the task.

 

[CC88]

If you look at the chart, the GPU in Slot 2 was the one that had a high CPU level when Topaz was performing the task.

For me it mean that the other one (slot1) is almost unused. So all the processing and projecting on the monitor is done in slot2.

 

[vett93]

For me it mean that the other one (slot1) is almost unused. So all the processing and projecting on the monitor is done in slot2.

The chart only showed processing. It did not show "projecting on the monitor".