MP 1,1-5,1 Help identifying Mac Pro 4,1/5,1 Crash

[Scrotorr]

I have 10 Mac Pros that are all having intermittent crashing issues - usually after sitting idle, though some users are having crashes throughout the day.

The main issue is the screen sleeping and not waking up - and they are no longer responsive to Apple Remote Desktop at that point. After a hard power down (holding power button until off) you have to do an SMC reset to get the machine to boot again. If you don't you'll get the boot chime, but nothing happens after that and even a quick press on the power button will shut down immediately.

I haven't been able to identify what's causing these crashes. My main Mac Pro at home doesn't have these issues at all and I've been running that for nearly a year. Today my office Mac Pro (5,1, stock dual 5675, 32GB, RX550 4GB) had the same issue. I checked the Northbridge heatsink on all machines and none of them are loose or have broken retaining clips.

9 machines are spec'ed the following:
Mac Pro 4,1->5,1
32 GB RAM - two 16GB sticks of 1333
1 TB AData SATA SSD
3 TB Seagate Barracuda SATA HDD (Time Machine)
Biostar RX550 4GB
OpenCore 0.6.2 (iMac Pro hybrid SMBIOS, AppleMCEReporterDisabler)
Mix of Catalina and Mojave

I've been digging through the logs in console and I haven't been able to identify anything. Any assistance would be much appreciated!

 

[MarkC426]

If you have 'hacked' your systems with Opencore, then you can expect problems....

Try this page for any symptoms:

OpenCore on the Mac Pro

This guide explains how to use the excellent OpenCore boot loader to install, run, and update the latest version of macOS on the MacPro5,1, resulting in a clean, unaltered operating system just like on a supported Mac.

forums.macrumors.com

 

[mikas]

Could it be the RX550 ?
I know RX460/RX560 and (RX570)/RX580 work and are supported in Mojave, but not the RX550.
Some RX550 DO work though (downwards rebinned ones, I have read).

Just a wild guess.

 

[Macschrauber]

Post a kernel Panic log if you re able.

 

[KeesMacPro]

As mentioned by @MarkC426 , I'd start eliminating the possibility of OpenCore as the cause,(after removing all drives with operating systems) by a clean install of e.g. Mojave on a SATA HDD/SSD and see if the issue persists.

 

[Scrotorr]

Could it be the RX550 ?
I know RX460/RX560 and (RX570)/RX580 work and are supported in Mojave, but not the RX550.
Some RX550 DO work though (downwards rebinned ones, I have read).

Just a wild guess.

These are rebinned RX560 cards from Biostar. I am not having any other identifiable issues with these and they work fine for the hybrid SMBIOS/acceleration setup.

Post a kernel Panic log if you re able.

There don't seem to be any Kernel panic logs for these lockups/hangs. There are a handful of KPs for an old install of MenuMeters that was on some of these machines, but that's it.

 

[Scrotorr]

Problem solved! I don't know why - but the ADATA SU760 SSDs were the culprit. I cloned the system over to a few other options - an old Intel SATA2 SSD, a Mushkin SATA3 SSD, an Seagate Barracuda spinning disk - no issues for any of those users at all and machines are up and stable for over 24 hours and didn't have sleep/wake issues. Weird controller on those SSDs? Or a strange voltage issue? I don't know. All I do know is that I now have 10+ SSDs that I don't trust to use in anything at work.