Mac Pro 6, 1 (Late 2013) is constantly restarting and getting error as "Your computer restarted because of a problem"

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I'll continue to provide any updates here (as long as it remains open) as I know from experience that these threads show up on Google and can be helpful even when they're out of date and no longer active..

Considering the pace in which Apple products evolve, Google search results tend to be very outdated, but so is your Mac Pro. Ten year old posts will still be relevant 😄

I'll ask a Community Manager to relocate this thread to Mac Pro - Apple Community. You don't need to do anything — you will be notified of any additional replies automatically.

The replacement CPU ought to be as good as ever. Intel's only references to the "Machine Check" error just indicate a fatal internal fault, which should never occur with properly functioning CPU. There is nothing else anyone can do other than to replace it. For $16 perhaps you should buy a spare or two.

Your 'error report after automatic reboot' in your first posting is unmistakably a RAM memory error.

These Macs feature horizontal error correction and detection. there is no need to run overnight test.

User Tip: Mac Pro and Error Correcting Co… - Apple Community

this part, especially detected 29 banks is the big tip-off:

Machine-check capabilities: 0x0000000001000c1d

family: 6 model: 62 stepping: 4 microcode: 1070

signature: 0x306e4

Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz

29 error-reporting banks

I’ve read similar reports from other Mac Pro owners, and in one case, a user traced it to the CPU. I’ve sourced a replacement CPU and plan to install it soon to see if it helps.

That fault is internal to the CPU. It is replaceable.

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You have several replacement options for that CPU, although I don't believe you can improve upon that one.

$16 sounds a little too good to be true, but that particular fault is definitely internal to the the CPU. References upon request.

I found a few on eBay but that was one the US site. Price was about twice as much though. The CPU you bought should be fine.

Well there are two ways to get bad results -- the RAM produces bad data, or the CPU reads it wrong. CPU reading it wrong is rare.

John Galt wrote:

I’ve read similar reports from other Mac Pro owners, and in one case, a user traced it to the CPU. I’ve sourced a replacement CPU and plan to install it soon to see if it helps.

That fault is internal to the CPU. It is replaceable.

Thanks for correcting my oversight. I'm just so used to responding to laptop issues, that I missed this was a Desktop system.

"Machine Check" kernel panics indicate a hardware issue with the Logic Board since the CPU is an integrated component. Sorry, but now is the time to retire this laptop.

This is one of those rare occasions in which someone describes a Mac Pro that really is a Mac Pro.

It really ought to be moved to hardware but I think the problem is solved.