HP 4GB PC2-5300 667MHz SDRAM ECC 240-Pin (491503-061) is an HP server memory module featuring 4GB of DDR2-667 PC2-5300 Fully Buffered DIMM (FBDIMM) technology. It is designed for enterprise server platforms requiring ECC memory, with a quad-rank 4Rx8 configuration, CL5 latency, and 1.8V operating voltage. The part is listed specifically as an HP 4GB DDR2-667 PC2-5300 fully buffered 240-pin quad-rank module.
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Part Number: 491503-061
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Manufacturer: HP / HPE
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Capacity: 4GB
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Module Configuration: 1 × 4GB
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Memory Type: DDR2 SDRAM
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Standard: PC2-5300
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Speed: 667MHz (DDR2-667)
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ECC: Yes
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Buffered: Fully Buffered (FBDIMM)
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Rank Configuration: Quad Rank, 4Rx8
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CAS Latency: CL5
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Form Factor: FBDIMM
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Pin Count: 240-pin
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Voltage: 1.8V
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Application: Enterprise server memory
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Compatible Systems: HP ProLiant servers using DDR2-667 FBDIMM architecture, including compatible DL360/DL380/ML370 G5 configurations.
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Technology: Fully Buffered DDR2 with ECC error detection/correction
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Server Use: Intended for server platforms; not standard desktop DDR2 memory.
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Related / Equivalent Part Numbers: 405477-061, 436251-001, 419008-001 and other compatible OEM memory references.