I have tested the RAM using TekTool Pro v. 3, and though I had one failure, it has passed maybe a dozen times. The documentation says that there can be occasional failures and not to worry, but it seems to me that this would be worth pursuing through other utilities. I have some software options available and will try them out over the weekend, along with installation of different RAM sticks.

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I would recommend using RAMometer of the RAM testing facility in GaugePro which is basically also RAMometer. These were free utilities from NewerTech. They may still be available on their site. If not, I think I have a copy of one or the other or both on my web space: http://www.io.com/~trag or http://www.jeffwalther.com.

I also recommend you use a method called the RAM Sandwich. If you search on that term in the archives for LEMList's SuperMacs list you should find a (several) detailed description(s) of the procedure. The issue it solves is that portions of a DIMM are occupied by the operating system, so a normal memory test does not test all locations in all of your DIMMs. The RAM Sandwich method overcomes this problem. The last discussion was probably four or five years ago at a guess. I'm not sure if that was before or after LEMLists switched to Google Groups.