I got a error about my server which is running CentOS5.5.

MCE 20
HARDWARE ERROR. This is *NOT* a software problem!
Please contact your hardware vendor
CPU 1 BANK 8 TSC 6ab9ff9745f62 [at 2394 Mhz 9 days 1:50:52 uptime (unreliable)]
MISC cf36ad0100081186 ADDR 203376500 
MCG status:
MCi status:
MCi_MISC register valid
MCi_ADDR register valid
Transaction: Memory read error
STATUS 8c0000400001009f MCGSTATUS 0

what is the matter? is memory card error or memory controller error?

  • Reality check: theese days memory controlelrs are on the CPU, including then ewest Intel Sandy bridge. AMD does that for some time. Second it iclearly says that CPU 1 BANK 8 is faulty. By all mens this has a 95% chance of being a memory error and it is trivial to validate (swap bank 8 with another bank). – TomTom Mar 12 '12 at 9:23

If you can restart the machine and get into the BIOS you may be able to see if there is a failed DIMM.

Basically your OS has detected a faulty piece of hardware. You need to figure out what exactly that means. Most likely you should try and backup your data to another machine or USB drive if you can and then start the troubleshooting process.

Depending on the server hardware you are using, sometimes the motherboard will detect the hardware fault and light up an LED beside the faulty DIMM.

Consult your hardware vendor's website and see if there is some kind of diagnostic tool provided by them that will help you test your hardware. Sometimes this can be done without rebooting but likely you will have to create a boot disk for their tool to run.

Your Answer


By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.