Skip to main content
CMS 256MB (1X256MB) SDRAM PC100, 133MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with IBM® Thinkpad 390X, 570, 570E, 600E, 600X, A20M - B95
Computer Memory Solutions

CMS 256MB (1X256MB) SDRAM PC100

Bottom line: The CMS 256MB SDRAM PC100 is a specs-and-price decision rather than a crowd-consensus one in the memory & ram category, priced around $27.50 on Amazon as of 2026-10-06. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

$27.50

As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →

Buy on Amazon — $27.50 Compare to similar memory & ram

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.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Computer Memory Solutions guarantees compatibility with models provided in description.
  • ✓ Backed by Computer Memory Solutions'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

1pcs of 256MB SDRAM PC100 SODIMM Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS Compatible with: IBM ThinkPad 390X, 570, 570E, 600E, 600X, A20m MAX MEMORY 512MB SOCKETS 2

Related Products

Other products in this category you may like:

SpecPicks Verdict

SpecPicks scored CMS 256MB SDRAM PC100 using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. Computer Memory Solutions'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

  • Computer Memory Solutions guarantees compatibility with models provided in description.
  • Memory Type: SODIMM, 144-Pin
  • Speed: 100 MHz
  • 1 Piece Kit
  • Product appearance may vary. Picture for reference only. limited lifetime warranty when bought directly from computer memory solutions

Full Specifications

BrandComputer Memory Solutions
Speed100 MHz
RAM Size0.25 GB
Form Factor184-PIN
Memory TypeSODIMM, 144-Pin
Memory Speed100 MHz
Model NumberCM3264100SO16CX1
Number of Pins144
Mfr Part NumberCM3264100SO16C
Compatible DevicesDesktop
Data Transfer Rate100 MHz
Additional FeaturesLightweight
Computer Memory Size0.25 GB
RAM Memory TechnologySDRAM DDR
Column Address Strobe Latency11
Full listing titleCMS 256MB (1X256MB) SDRAM PC100, 133MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with IBM® Thinkpad 390X, 570, 570E, 600E, 600X, A20M - B95

Ready to buy?

CMS 256MB (1X256MB) SDRAM PC100, 133MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with IBM® Thinkpad 390X, 570, 570E, 600E, 600X, A20M - B95 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.

Buy on Amazon — $27.50

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Related Memory & RAM

Keep exploring SpecPicks

Other buying guides

Browse the catalog

Editorial

More guides & deep dives from the SpecPicks archive

Browse all articles & guides →

More reviews from the SpecPicks archive

Browse all reviews →

Earliest SpecPicks reviews

Browse full archive →
CMS 256MB (1X256MB) SDRAM PC100, 133MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with IBM® Thinkpad 390X, 570, 570E, 600E, 600X, A20M - B95
$27.50
View on Amazon →