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128MB 100 pin PC100 Printer Memory DIMM Compatible with HP C9121A Q7709A for LaserJet 4100 4100n 4100t 4100tn 4100dtn 4100MEP 4100MFP
Keystron

Keystron 128MB 100 pin PC100 Printer Memory DIMM

Bottom line: The Keystron 128MB 100 pin PC100 Printer Memory DIMM is a specs-and-price decision rather than a crowd-consensus one in the memory & ram category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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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

  • ✓ One 128MB PC100 100-pin sodimm
  • ✓ Backed by Keystron's warranty and support channels

Cons

  • ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

Manufacturer description

Compatible with HP LaserJet 4100, 4100n, 4100t, 4100tn, 4100dtn, 4100MEP, 4100MFP

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SpecPicks Verdict

SpecPicks scored Keystron 128MB 100 pin PC100 Printer Memory DIMM using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. Keystron's memory & ram lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. 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

  • One 128MB PC100 100-pin sodimm
  • Part#: C9121A, Q9121A, Q7709A
  • 100% compatible with lifetime replacement warranty
  • Manufactured by Keystron, LLC
  • Keystron is a registered trademark of Keystron, LLC

Full Specifications

BrandKeystron
Part#C9121A, Q9121A, Q7709A
RAM Size128 MB
Form FactorDIMM
Memory Speed100 mt_s
Model NumberC9121A, Q9121A, Q7709A
Number of Pins100
Mfr Part NumberLYSB00H4JP424-CMPTRACCS
Compatible DevicesPrinter
Additional FeaturesLightweight
Computer Memory Size128 MB
RAM Memory Technologysdram
Full listing title128MB 100 pin PC100 Printer Memory DIMM Compatible with HP C9121A Q7709A for LaserJet 4100 4100n 4100t 4100tn 4100dtn 4100MEP 4100MFP

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128MB 100 pin PC100 Printer Memory DIMM Compatible with HP C9121A Q7709A for LaserJet 4100 4100n 4100t 4100tn 4100dtn 4100MEP 4100MFP is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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128MB 100 pin PC100 Printer Memory DIMM Compatible with HP C9121A Q7709A for LaserJet 4100 4100n 4100t 4100tn 4100dtn 4100MEP 4100MFP
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