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That's a good question. The 512 I was looking at was a single stick, but the 512 preinstalled might be two. I don't know if that would work or not. Four 256s would work (assuming there are four DIMM slots). The only drawback with that is that it makes it harder to add more memory in the future.

Regardless, even if you bought 1GB from NewEgg and threw the preinstalled memory away, you'd still be doing better than getting the memory upgrade from the Dell Configurator.