Failed CPU 7

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Failed CPU 7

Postby brendalcampbell » Mon May 11, 2020 3:32 pm

Hello. What does failed CPU 7 mean on my Mac? I've restarted, nothing is working. Been like this for days.

Thanks everyone!

Stay safe and healthy!

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Joined: Wed Apr 08, 2020 11:33 pm

Re: Failed CPU 7

Postby Neil-B » Mon May 11, 2020 4:06 pm

Welcome to the forums Brenda !!

If you could post your log (including top 100 lines or so that show the configuration along with a sample of the error) and someone may be able to assist diagnose/resolve the issue you are having … For guidance on posting logs see

I'll guess that your mac has 8 cores (or four cores/8 threads) and is the CPU slot is set up in "auto" configuration (-1) which allocates the CPU slot the total thread count less one for each graphics card … so CPU: 7 would refer to that having an issue - but the log will help get it sorted out.
1: 2x Xeon E5-2697v3@2.60GHz, 512GB DDR4 LRDIMM, SSD Raid, Win10 Ent, Quadro K420 1GB, FAH 7.6.13
2: Xeon E3-1505Mv5@2.80GHz, 32GB DDR4, NVME, Win10 Pro, Quadro M1000M 2GB, FAH 7.6.13
3: i7-960@3.20GHz, 12GB DDR3, SSD, Win10 Pro, GTX 750Ti 2GB, FAH 7.6.13
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Re: Failed CPU 7

Postby bruce » Mon May 11, 2020 4:14 pm

Welcome to, brendalcampbell

The software that uses the CPU to process WUs, called Gromacs or FAHCore_a7, divides the WU up into segments and assigns a segment to each CPU so they can process the forces and motions of the atoms in parallel. I does not work when there are 7 segments or other prime numbers. This number varies when you move the slider, but it also can be adjusted with the FAHControl program. You probably have a CPU that supports 8 threads. (if you post the first couple of pages of FAH's log we can confirm that guess.) Moving the Power slider to Full will probably correct this error.
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