MP 6,1 2013 CPU Upgrade Woes

[MultiFinder17]

I'm having some trouble with upgrading my 2013 Mac Pro. It originally had the 8-core Xeon, and I got a 12-core to replace it with. Upon reassembly, it chimes and boots, but the fan ramps up to full speed and the system is slow as molasses. I tried swapping the original CPU back in and got the same result. Any idea what it's doing and how I can help the poor thing out? Thank you ^_^

 

[tsialex]

Check if the AirPort Extreme cable is fully connected, inspect both sides of the flat cable. If the cable is not connected absolutely perfectly, the Mac Pro slows to a crawl.

iFixit teardown step number 8:

Mac Pro Late 2013 Teardown

After making its debut during the WWDC 2013 Keynote, the reimagined, reformulated Mac Pro finally arrived at iFixit's doorstep. Join us as we turn...

www.ifixit.com

This is the iFixit repair guide for the AirPort:

Mac Pro Late 2013 AirPort Card Replacement

Use this guide to replace the AirPort card in your Mac Pro Late 2013.

www.ifixit.com

You can also try to run Apple Diagnostics and see any error codes.

 

[MultiFinder17]

Check if the AirPort Extreme cable is fully connected, inspect both sides of the flat cable. If the cable is not connected absolutely perfectly, the Mac Pro slows to a crawl.

iFixit teardown step number 8:

Mac Pro Late 2013 Teardown

After making its debut during the WWDC 2013 Keynote, the reimagined, reformulated Mac Pro finally arrived at iFixit's doorstep. Join us as we turn...

www.ifixit.com

This is the iFixit repair guide for the AirPort:

Mac Pro Late 2013 AirPort Card Replacement

Use this guide to replace the AirPort card in your Mac Pro Late 2013.

www.ifixit.com

You can also try to run Apple Diagnostics and see any error codes.

Thank you for the tips. I tried reseating the cable on both ends, no dice.

In addition I ran Apple Diagnostics and got this from it, any ideas from here? Everything I read online seems to indicate that it’s one of the cables that’s not quite seated perfectly, so I’m going to do a complete tear down and rebuild once again to double check every connection.

 

[tsialex]

Thank you for the tips. I tried reseating the cable on both ends, no dice.

In addition I ran Apple Diagnostics and got this from it, any ideas from here?

View attachment 2586974

PFM006 & PPN001 error in diagnostics - Mac Pro Late 2013

I have an MacPro6,1, the 2013 year model which has the kernel_task going to 900% and fans at full speed. I’ve run the diagnostics tool and it came up with the following two errors: • PFM006 - There may be an issue with the System Management Controller (SMC) • PPM001 - There may be an issue...

www.ifixit.com

 

[MultiFinder17]

PFM006 & PPN001 error in diagnostics - Mac Pro Late 2013

I have an MacPro6,1, the 2013 year model which has the kernel_task going to 900% and fans at full speed. I’ve run the diagnostics tool and it came up with the following two errors: • PFM006 - There may be an issue with the System Management Controller (SMC) • PPM001 - There may be an issue...

www.ifixit.com

Thank you, I found that post on iFixit while googling and reseated the cable. I just finished with my rebuild, same symptoms. Running diagnostics again to see if the errors are any different or not.