PTS is right. If scrap RAM is worth $0.50 per stick, and there are two sticks per computer, that's $1 worth of RAM.
If that same computer has 2 1GB sticks of DDR2, that's $2.50 worth of RAM. Big difference.
The Dell OptiPlex GX520 will likely be fairly stripped down, though. The GX620s were the more premium product in their time.
But, you never know. I once opened a Dimension E510 (A Basic machine) to find dual 500GB hard drives and 4GB of RAM.
Depending on the number of systems, I'd give it a shot... if nothing else just to get your feet wet.
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