Apple Server Diagnostics - Memory Tests

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Memory Tests

All memory tests are categorized here.

Simple Memory Tests

Server Diagnostics Mac OS X memory tests test the first 2.5 GB of memory. All
multicore memory tests listed in Server Diagnostics EFI are run.

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Server Diagnostics Test Reference


Even though these tests don’t test all memory, run these tests to detect intermittent
memory issues.

After the first 2.5 GB of memory is tested, the memory test then tests for ECC errors.
When an ECC error occurs, memory catches the problem and fixes it. The test detects
the number of memory fixes and reports them.

Note: The time required to complete memory tests correlates to the size of memory
being tested. These estimates are based on testing 1 GB of memory.


Estimated completion time


Simple Test

17 minutes

Runs all multicore memory
tests listed in Server Diagnostics
EFI, reports the number of
ECC errors, and then resets the