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HP 4GB DDR3 SDRAM Memory Module Registered ECC (500658-B21)

HP 4GB DDR3 SDRAM Memory Module Registered ECC (500658-B21)

Bottom line: The HP 4GB DDR3 SDRAM Memory Module Registered ECC: Genuine HP spare part 500658-B21 makes cross-referencing an exact match; main trade-off: just 4GB per module, so large-memory builds need many DIMMs.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ Genuine HP spare part 500658-B21 makes cross-referencing an exact match
  • ✓ Registered ECC (RDIMM) module, not unbuffered desktop DDR3
  • ✓ PC3-10600 DDR3-1333 speed and CAS-9 latency are both published
  • ✓ Dual rank x4 layout, the standard for high-density DDR3 server channels

Cons

  • ✗ Just 4GB per module, so large-memory builds need many DIMMs
  • ✗ DDR3-1333 is well behind current DDR4 and DDR5 platforms
  • ✗ Registered ECC needs a board that accepts RDIMMs, not a typical desktop
  • ✗ Sold as a single 1x4GB module, not a matched multi-DIMM kit

Manufacturer description

HEWLETT PACKARD DDR3 SDRAM - 4 GB - DIMM 240-PIN - 1333 MHZ

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SpecPicks Verdict

SpecPicks scored HP 4GB DDR3 SDRAM Memory Module Registered ECC using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. Compare with similarly-priced alternatives in the memory & ram category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for memory & ram of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • HP 4GB (1x4GB) Dual Rank x4 PC3-10600 (DDR3-1333) registered CAS-9 memory kit

Full Specifications

LanguageEnglish
National Stock Number7025-01-579-4782

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HP 4GB DDR3 SDRAM Memory Module Registered ECC (500658-B21)
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