Each will test memory differently and some may miss a problem that another can detect. But, as I say, there are many of them just check the Mac App Store and search for RAM. You can also get a graphical wrapper for memtest, called Memtest, which is run from the Terminal command-line.
In addition to Apple’s testing suite, there are plenty of third-party memory-testing utilities. If everything is OK, you’ll see a message that states all tests passed and no problems were found.
If the hardware test finds any faulty memory, it will list the faulty memory addresses. Note that, if you have formatted your hard drive and reinstalled OS X, then the built-in hardware tests may have been wiped however, you can still load them from the Internet by holding the Option-D key combination (as opposed to just D) at startup when you hear the boot chimes. On newer Macs, the tests run automatically when the utility is invoked it appears with a gray background instead of blue.
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