jward52,
One thing you have to realize is that some memory sticks don't work on every motherboard, whether it be one that was manufactured/sold by Asus, MSI, Abit, Dell, Gateway, etc.
It's quite possible that in your situation a few years ago, the memory you purchased didn't have compatible timings or densities that the Dell motherboard required. This has been a common problem since the early days of the Pentium I and before. The older the system, the less compatible the motherboard was.
But even so, I don't believe (and someone correct me if I'm wrong) that Dell ever had proprietary memory requirements. They might have other proprietary components like the power supply, but I've seldom had problems using 3rd-party memory in a Dell system.
~cdogg
"Insanity: doing the same thing over and over again and expecting different results." - Albert Einstein
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