Memtest86+ on Intel Mac

As the name suggests, Memtest86+ is a very thorough memory testing program for x86 computers. With slight modification of a patch for the Grub bootloader, it will run on Intel Macs.

Here is a patch against memtest86+ 1.70, or a prebuilt .iso image. I've be interested to hear how it works on other Macs, especially those with large amounts of RAM.

Updated 9 July 2007 to skip the bottom ~1.2MB of memory to avoid spurious errors.


Works on my machine badge of approval

Proof! It worked first time:

photo of memtest86 running on a macbook

9 March 2007
Matt Johnston <matt at>

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