IBM

IBM 256MB 168-Pin 100Mhz DIMM SDRAM

Name: IBM 256MB 168-Pin 100Mhz DIMM SDRAM
Brand: IBM
SKU: B00004Z9MA

Bottom line: The IBM 256MB 168-Pin 100Mhz DIMM SDRAM 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 Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-20

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. About the author →

Before you buy

Confirm socket / form-factor / power-rating compatibility against your build before ordering
Used and vintage listings vary by seller and condition — check the listing photos, description and return terms before buying

Manufacturer description

IBM - 512 MB MEMORY PC 100 ECC

SpecPicks Verdict

SpecPicks scored IBM 256MB 168-Pin 100Mhz DIMM SDRAM using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. IBM'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.

Full Specifications

Brand	IBM
RAM Size	256 MB
Form Factor	168-pin_DIMM
Memory Speed	100 MHz
Model Number	01K1139
Number of Pins	168
Mfr Part Number	01K1139
Special Feature	Ecc, Lightweight
Item Part Number	01K1139
Additional Features	Ecc, Lightweight
Computer Memory Size	256 MB
RAM Memory Technology	sdram
Global Trade Identification Number	00087944391319, 05705965280744

Ready to buy?

IBM 256MB 168-Pin 100Mhz DIMM SDRAM is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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