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MemTest86+
Linux, Mac OS, WindowsAlternatives

Provides a lot more information than the Windows memory tester, with a small download

 test-memory, test-ram, memory-diagnostic-tool    System Tools & Info, Memory Testing Utility    Free (Open source)
Editor Rating:
4
MemTest86
Linux, Mac OS, WindowsAlternatives

Provides a lot more information than the Windows memory tester, with more options

 test-memory, test-ram, memory-diagnostic-tool    System Tools & Info, Memory Testing Utility    Free (Limited features)
Editor Rating:
4