I have been running OpenCore and Monterey with an AMD RX5700XT GPU on my Mac Pro 5,1 for the past couple of years and everything has been working fine.
Recently I thought I would give OCLP and Sequoia a try (it took me ages to discover that that wouldn’t work with the 5700XT), so I have replaced the 5700XT with a Vega 64.
Now the problems with the Vega 64 begin. Every so often (and always in some circumstances) I get a sudden black screen and all the fans run at 100%. The only option is to power the Mac Pro off and then on again.
This appears to happen when the GPU is put under load (sitting here writing this, everything is working fine). On Mac OS (either Monterey with OpenCore or Sequoia with OCLP) It happens sometimes with graphics programs processing a photo (e.g. Topaz Photo ai), or occasionally while running a GPU test with Geekbench. Under Windows 10 it happens every time about 2 minutes into a game (Baldur’s Gate 3)
It doesn’t necessarily seem to happen when the GPU is at its most active and it doesn’t appear to have anything to do with temperature (even under load it seems to run at something under 70 celsius and that last time it crashed it was only on 54). It also doesn’t make any difference which position the bios switch is in — it crashes equally with both.
One possibility is that this has something to do with power. However I have the Pixlas mod on my Mac Pro, so power comes straight from the PSU into two eight pin connectors. (Is it still possible that the GPU needs more?)
I have found some others who have had the same black screen and fans problem, but they have all been running windows machines and the discussion usually ends up being about drivers.
If anyone has any ideas in the cmp world I will be very happy to hear them and a solution would be even better.
Thanks to all and my apologies if this has already been discussed (my search skills were not good enough to find it).
Recently I thought I would give OCLP and Sequoia a try (it took me ages to discover that that wouldn’t work with the 5700XT), so I have replaced the 5700XT with a Vega 64.
Now the problems with the Vega 64 begin. Every so often (and always in some circumstances) I get a sudden black screen and all the fans run at 100%. The only option is to power the Mac Pro off and then on again.
This appears to happen when the GPU is put under load (sitting here writing this, everything is working fine). On Mac OS (either Monterey with OpenCore or Sequoia with OCLP) It happens sometimes with graphics programs processing a photo (e.g. Topaz Photo ai), or occasionally while running a GPU test with Geekbench. Under Windows 10 it happens every time about 2 minutes into a game (Baldur’s Gate 3)
It doesn’t necessarily seem to happen when the GPU is at its most active and it doesn’t appear to have anything to do with temperature (even under load it seems to run at something under 70 celsius and that last time it crashed it was only on 54). It also doesn’t make any difference which position the bios switch is in — it crashes equally with both.
One possibility is that this has something to do with power. However I have the Pixlas mod on my Mac Pro, so power comes straight from the PSU into two eight pin connectors. (Is it still possible that the GPU needs more?)
I have found some others who have had the same black screen and fans problem, but they have all been running windows machines and the discussion usually ends up being about drivers.
If anyone has any ideas in the cmp world I will be very happy to hear them and a solution would be even better.
Thanks to all and my apologies if this has already been discussed (my search skills were not good enough to find it).