I’ve been daily driving a Mac Pro 6,1 8-Core Dual D700 64Gb RAM 1TB with the latest macOS updates thanks to OCLP versions since 2020. Even though things have not necessarily been flawless, the machine has been reliable and mostly stable. I’ve taken a break off work since 2025 and have been noticing some serious issues lately but couldn’t say which update introduced them because of the lack of use on my part with Sequoia.
The Mac after some time of use will freeze (my trackpad stops clicking too) before the fan will progressively spin faster (probably goes from 800 to 1500rpm in about 20 seconds) then completely shuts off. It was running 15.5 and some previous 15.4.x updates also did that. Did I miss a setting when setting it up for it to cause this crash? Could this be the certain hibernation issue? I’ve since downgraded to Monterey (no OCLP) which feels super fast and smooth and presents no issue at all. However, now I’m missing some quality of life features introduced since and would consider updating it using OCLP again. I’ve researched different threads to see if this was a known issue but got no luck.
The most troublesome issues prior to this were the rendering issue in electron based apps such as Google Chrome which show red windows and slow down the computer by a lot. This can be worked around with the launcher. Installing updates seemed to remove the root patches which disables UI transparency and make the computer very slow. Typing the password at login may also be impossible if an animated emoji is used as a profile picture. And often the two external displays connected via Thunderbolt 2 using T3 to T2 adapters are taking too long to detect and turn on (usually have to unplug and re-plug at every startup for both monitor to work).
I’ve been considering getting a Silicon Mac which have now caught to speed with GPU performance (which will happen eventually). But continuing to use the MP6,1 is financially a much more desirable route for now which is why I downgraded.
Overall, does it appear as though the issues I’m experiencing are caused by a lack of setup on my part? Is the freeze followed by a hard shutdown a preventable known issue? Is there a specific version of macOS which will be more stable for the MP6,1?
Any input regarding these matters which be highly appreciated. Thank you.
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