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I have a 8-core Mac Pro 3.1 that keeps getting kernel panics randomly. This happens even when no applications are running. The error message is:

Uncorrectable Fbd memory error...

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This sounds like a problem with memory; you may want to run Apple Hardware Test and Memtest to be sure. Posting the complete error message would also be helpful. –  Moses Aug 27 '13 at 23:07
    
Maybe this is more suitable for Ask Different. I would recommend that you told us what programs you were using at the time of the kernel panic. –  Doktoro Reichard Aug 28 '13 at 0:57
    
If you can reboot, does it say, if any, which DIMM(s) of the memory are affected? This is most likely a defective piece of memory (FBD means fully-buffered-dimm, which is a type of server memory that they use in Mac Pro computers, designed to be resilient, but not immune to failure). –  ionFish Aug 28 '13 at 1:43
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