On some of our older servers we have an issue where the official memtest CD does not boot while using IPMI (virtual CD drive). Upon looking for a work around we found 2 options to allow memtest to run even if it did not boot from the official ISO. The first option is RIPLinux 9.3 (we prefer the non-X version), just boot the CD and select the Memory Test option.

The second option is UBCD5 (in beta currently, v4 did not work over IPMI), just start the CD, select the Memory menu and select which version of Memtest you wish to use.

UBCD5 comes with the latest version (4) of memtest, while RIPLinux comes with v2.