Just a quick note related to my old memory-testing related post: memtest86+ now runs on Intel Macs just fine. Just download the pre-compiled bootable ISO file, use Disk Utility to create a CD out of it, and boot from it. This is much better than the previous solution where you had to boot Mac OS X in single-user mode, because memtest86+ won’t need Mac OS X (or any other OS) to run, which means it uses a very, very small memory footprint. The least memory you’re using, the more memory memtest will be able to test. This version of memtest uses a few KB of RAM. Booting Mac OS X, even in single user mode, will use at least 50 MB. It’s a really huge difference. And being able to boot directly from a CD is pretty handy.
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Many thanks for the update.
For those stilling using PPC Macs, you will still need memtest for the Mac.
The latest version of memtest for the Mac is 4.22. It can be found here for free:
http://www.command-tab.com/2008/01/11/how-to-test-ram-under-mac-os-x/