This listing is for one (1) Nanya 512MB PC2-4200U DDR2-533MHz Unbuffered Desktop RAM Memory Module. It's a 240-pin DIMM, ideal for upgrading or replacing memory in compatible desktop systems. The module is 1RX8 (single rank) and operates at a bus speed of 533MHz (PC2-4200U). Please ensure compatibility with your motherboard and existing memory before purchasing. Tested and in good working condition.

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