Sure, DU is on the install disk(s) exactly for what you mentioned, it's the 'ability' and 'intelligence' of not installing it on the boot volume that I'm questioning.
I also have that version. The main memory test is in Tests->Hardware->Main Memory. Fourth item down in the list of Hardware tests.[attachment=982:TTP_Memory_Tests.jpg]
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Not sure what you thought implied [that I had] not installing DU on the HD...
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Apple's Disk Utility is also on the OS X Install disc. I don't see that in the finder window of either disc when I put them in the drive. For that matter, I don't see it on the discs before I put them in the drive.
My bad, I assumed you meant you didn't find DU on your HD with "either discs before" you put them in the drive. In other words, when looking at your HD. I now see that it was a 'bit 'o humor' that messed up my hair as it flew over my head!
I'm not a speed reader but I do jump to conclusions fairly quickly!