This is a SK hynix (formerly Hynix) DDR2 SDRAM desktop memory module (UDIMM). Key Specifications: • Capacity: 512 MB • Type: DDR2 (second-generation double data rate synchronous dynamic RAM) • Speed: 667 MHz (DDR2-667, marketed as PC2-5300) • Form Factor: 240-pin DIMM (unbuffered, for desktop PCs) • Rank/Organization: Single Rank, 1Rx8 (8 chips on one side, each 64M x 8-bit) • CAS Latency (CL): 5 (from the “-555-” in PC2-5300U-555-12) • Voltage: 1.8V • ECC: Non-ECC (no error correction) • Buffered/Registered: Unbuffered • Part Number: HYMP564U64CP8-Y5 AB-C (or similar variant) • Other Notes: “Eco” label indicates a low-power or RoHS-compliant version. Made in Korea.
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