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Hynix HYMP125U64CP8-S6 4GB 2 x 2GB PC2-6400U DDR2 800 Non-ECC Unbuff Memory Kit
SK Hynix

Hynix HYMP125U64CP8-S6 4GB 2 x 2GB PC2-6400U DDR2 800 Non-ECC Unbuff Memory Kit

Bottom line: The Hynix 4GB 2 x 2GB PC2-6400U DDR2 800 Non-ECC Unbuff Memory Kit 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.

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

Specifications : Manufacturer: Hynix Part Number: HYMP125U64CP8-S6. Memory Type: DDR2 SDRAM Capacity: 4GB 2 x 2GB Pins: 240 Pin Bus Type: PC2-6400. Error Correction: No ECC Cycle Time: 5ns Cas: CL6 Data Transfer Rate: 800Mhz Memory Clock: 200 MHz Voltage: 1.8

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SpecPicks Verdict

SpecPicks scored Hynix 4GB 2 x 2GB PC2-6400U DDR2 800 Non-ECC Unbuff Memory Kit using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. SK Hynix'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

BrandSK Hynix
Voltage1.8 volts
RAM Size4 GB
Form FactorDIMM
Memory Speed800 MHz
Model NumberHYMP125U64CP8-S6
Number of Pins240
Mfr Part NumberLYSB00TIY959G-CMPTRACCS
Number of Items2
Compatible DevicesDesktop
Data Transfer Rate800 MHz
Additional FeaturesLightweight
Computer Memory Size4 GB
RAM Memory TechnologyDDR2
Column Address Strobe Latency6

Ready to buy?

Hynix HYMP125U64CP8-S6 4GB 2 x 2GB PC2-6400U DDR2 800 Non-ECC Unbuff Memory Kit 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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Hynix HYMP125U64CP8-S6 4GB 2 x 2GB PC2-6400U DDR2 800 Non-ECC Unbuff Memory Kit
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