Ohata RAM Scrap Classification Guide | RAM-S, RAM-A, RAM-B, RAM-C & RAM-D

Part 1 – Fundamentals (Introduction, Ohata RAM Classification System, Engineering Characteristics, Recoverable Materials)

Introduction

Random Access Memory (RAM) is one of the most widely recycled electronic components found in desktop computers, laptops, enterprise servers, workstations, networking equipment, industrial computers, and embedded systems. Although RAM modules often appear similar, they vary considerably in engineering design, component density, PCB construction, and recoverable material content.

RAM modules are typically removed together with desktop motherboards, server motherboards, and CPUs during computer recycling. Understanding how these components are classified helps improve sorting accuracy and purchasing consistency throughout the electronic recycling process. The Ohata RAM Scrap Classification System was developed to provide a consistent engineering-based method for identifying and classifying RAM modules used in electronic recycling. Rather than relying on manufacturer, memory capacity, memory generation, or original retail value, the Ohata system evaluates measurable physical characteristics that can be verified through visual inspection.

This guide explains the principles behind the Ohata RAM Classification System, the characteristics used during inspection, and how RAM modules are classified into five engineering-based grades.

Related pages

• Apple MacBook Laptop Logic Board Scrap

• Ohata CPU Scrap Classification Wiki

History of RAM Technology

Computer memory has evolved from magnetic core memory to modern semiconductor RAM. As computers became more compact and powerful, memory technology progressed from DIP chips to removable SIMM and later DIMM modules, making upgrades and maintenance much easier.

Today, RAM technologies include SDRAM, DDR, DDR2, DDR3, DDR4, and DDR5, while enterprise systems commonly use ECC and Registered DIMMs (RDIMMs) for improved reliability. Despite these technological advances, most modern RAM modules share similar engineering features, including multilayer PCBs, surface-mounted integrated circuits, and gold-plated edge connectors.

As millions of computers reach the end of their service life each year, obsolete and surplus RAM continues to provide an important source of recyclable electronic materials.

Why RAM Is Valuable for Recycling

Although compact, RAM modules contain valuable recoverable materials, including gold-plated edge connectors, integrated circuits, multilayer PCBs, copper, and precious metal bond wires.

Enterprise server RAM generally contains higher integrated circuit density than standard consumer memory, resulting in greater recoverable material content. In addition, RAM modules are easy to identify and sort, making them an efficient and consistent category within electronic recycling.

Proper classification improves sorting accuracy, purchasing consistency, and downstream material recovery.

Overview of the Ohata RAM Classification System

The Ohata RAM Scrap Classification System organizes RAM modules into five engineering-based grades.

Ohata RAM Scrap Classification Guide

Each grade represents a different combination of engineering complexity, module condition, and recoverable material content. Detailed explanations of each grade are provided in Part 2.

Classification Criteria

The Ohata RAM Scrap Classification System is founded on objective engineering evaluation rather than subjective appearance or commercial value. Every memory module is inspected according to measurable physical characteristics that directly influence recoverable material content.

Classification considers multiple technical factors simultaneously, including:

• Integrated circuit density

• Gold finger condition

• PCB construction quality

• Server or consumer application

• Presence of heatsinks or shields

• Module completeness

• Surface-mounted component density

• Recoverable metal content

• Overall engineering quality

No single characteristic determines the classification. Instead, inspectors evaluate the complete electronic assembly before assigning an Ohata RAM grade.

This methodology allows similar RAM modules from different manufacturers to receive consistent classifications while reducing disagreements caused by changing computer technology or fluctuating precious metal prices.

Engineering Characteristics Used for Classification

Several engineering characteristics are used throughout the Ohata RAM Classification System.

Integrated Circuit Density

The number, size, and arrangement of integrated circuits are among the most important identification factors. Enterprise server RAM generally contains a higher semiconductor density than consumer memory.

Gold Fingers

Gold-plated edge connectors provide the electrical interface between the RAM module and the motherboard. Their condition is an important visual indicator during classification. Clean, complete gold fingers generally represent higher-quality recyclable material than trimmed or damaged connectors.

PCB Construction

Most RAM modules are manufactured using multilayer fiberglass printed circuit boards with internal copper layers. PCB quality influences both long-term reliability and recoverable material content.

Server and Consumer Memory

Enterprise RAM often contains ECC circuitry, register chips, additional controllers, and higher component density. Consumer memory is generally simpler in construction while remaining an important source of recoverable electronic materials.

Module Condition

Physical condition is also evaluated during classification. Complete modules generally provide greater recycling value than broken, contaminated, incomplete, or heavily damaged RAM.

Recoverable Materials

Although RAM modules are compact, they contain several economically recoverable materials.

Gold

Gold is primarily found on:

• Edge connectors (gold fingers)

• Integrated circuit bond wires

• Selected communication contacts

Gold provides excellent corrosion resistance and dependable electrical performance throughout the module's service life.

Copper

Copper is the largest recoverable metal by weight.

It is present in:

• Internal PCB layers

• Signal traces

• Power distribution planes

• Grounding networks

Modern multilayer PCB construction substantially increases recoverable copper.

Silver

Silver may be recovered from selected solder materials, connector contacts, and certain electronic components used during manufacturing.

Although silver concentrations are relatively modest, they contribute to the module's total recoverable value.

Palladium

Many multilayer ceramic capacitors installed on RAM modules contain trace quantities of palladium.

While individually small, these components become economically significant when processed in large recycling volumes.

Part 2 – RAM Grades (RAM S to RAM D)

Introduction to the RAM Grades

Modern computer memory exists in hundreds of different models, capacities, and form factors. While these modules may appear similar at first glance, their engineering design, intended application, and recoverable material content vary considerably. Enterprise server memory often contains more integrated circuits and higher-quality PCB construction than consumer desktop memory, while damaged or incomplete modules require different purchasing guide because of reduced recoverable value.

The Ohata RAM Scrap Classification System organizes memory modules into five practical engineering-based categories: RAM-S, RAM-A, RAM-B, RAM-C, and RAM-D. Rather than relying on manufacturer names or storage capacity, the system evaluates measurable physical characteristics such as integrated circuit density, PCB quality, gold finger condition, module completeness, and overall recoverable material content. This approach allows recyclers to classify RAM consistently regardless of technological generation or market demand.

RAM-S – Server ECC Registered RAM

RAM-S represents the highest-value memory category within the Ohata RAM Scrap Classification System. These modules are commonly removed from enterprise servers, cloud computing infrastructure, high-performance workstations, storage arrays, and mission-critical data center equipment.

Unlike ordinary desktop memory, server RAM is designed for continuous operation under demanding workloads. Manufacturers use premium PCB materials, stricter manufacturing tolerances, and additional control circuitry to improve long-term reliability.

Typical RAM-S characteristics include:

• ECC (Error Correcting Code) memory

• Registered (RDIMM) architecture

• High integrated circuit density

• Gold-plated edge connectors

• Double-sided memory ICs

• Register or buffer chips

• No large aluminum heatsinks

• Premium multilayer PCB construction

Because server memory usually contains more semiconductor packages than consumer RAM, it generally offers greater recoverable material value.

Typical applications include:

• Enterprise servers

• Blade servers

• Cloud computing systems

• Database servers

• Virtualization platforms

• Scientific computing

• AI servers

• High-performance computing (HPC)

RAM-A – Desktop & Laptop Gold Finger RAM

RAM-A includes standard consumer memory modules removed from desktop computers, laptops, gaming systems, office workstations, and embedded computing devices.

This category covers the majority of DDR memory produced during the past twenty years.

Typical products include:

• DDR

• DDR2

• DDR3

• DDR4

• DDR5

• Laptop SO-DIMM memory

• Desktop DIMM memory

Common characteristics include:

• Clean gold-plated edge connectors

• Standard PCB construction

• Surface-mounted memory ICs

• EEPROM/SPD controller

• No oversized heatsinks

• Good overall condition

Although consumer RAM generally contains fewer integrated circuits than enterprise server memory, it remains an important source of recoverable gold, copper, and semiconductor materials.

RAM-B – Shielded RAM, Silver/Tin RAM & Trimmed RAM

RAM-B includes memory modules that require additional processing before refining or contain physical characteristics that reduce purchasing value compared with standard gold finger RAM.

Typical examples include:

• RAM with aluminum heat spreaders

• Shielded gaming RAM

• Silver-colored connector edge modules

• Tin-finished connector modules

• Trimmed RAM

• Memory with decorative metal covers

These products remain valuable but require extra labor because heat spreaders, shields, or damaged connector sections often need to be removed before downstream processing.

Typical characteristics include:

• Metal shielding

• Decorative aluminum covers

• Partial connector trimming

• Lower visible gold

• Standard memory IC density

RAM-C – Mixed & Damaged RAM

RAM-C consists of memory modules whose physical condition reduces their recycling value.

Typical examples include:

• Broken PCB

• Missing memory chips

• Burn damage

• Corrosion

• Heavy contamination

• Mixed electronic scrap

• Bent modules

• Labels, tape, or foreign materials attached

Although these modules remain recyclable, contamination increases handling costs and reduces sorting efficiency.

Whenever possible, RAM should be separated by grade before delivery to improve purchasing consistency.

RAM-D – Blank RAM

RAM-D represents the lowest-value memory category.

Typical examples include:

• Blank PCB

• Memory module with no IC chips

• Extremely low component density

• Manufacturing rejects

• Training boards

• Display-only modules

These boards contain significantly fewer recoverable electronic materials than complete memory modules.

Comparison of RAM Grades

Although the five grades may appear similar, they are distinguished by their engineering characteristics and physical condition.

SDRAM Through DDR5

The Ohata RAM Classification System is independent of memory generation. Older and newer memory technologies may qualify for the same grade if their engineering characteristics are similar.

Common generations include:

SDRAM

Synchronous Dynamic Random Access Memory (SDRAM) became widely used during the late 1990s. These modules introduced synchronized clock operation that significantly improved system performance compared with earlier asynchronous memory.

DDR

Double Data Rate (DDR) memory doubled data transfer efficiency by transferring information on both clock edges.

DDR2

DDR2 introduced lower operating voltage, improved bandwidth, and increased memory density.

DDR3

DDR3 further reduced power consumption while increasing operating frequency and storage capacity.

DDR4

DDR4 improved energy efficiency, operating speed, and reliability, becoming the dominant memory technology for desktop and server systems throughout the late 2010s.

DDR5

DDR5 provides significantly higher bandwidth, increased module capacity, and improved power management compared with previous generations.

Although newer generations generally provide greater computing performance, recycling classification depends primarily upon physical construction rather than memory speed.

ECC vs Non-ECC Memory

One of the easiest methods of identifying server memory is determining whether the module supports Error Correcting Code (ECC).

ECC Memory

ECC RAM automatically detects and corrects certain memory errors during operation.

Common characteristics include:

• Enterprise servers

• Workstations

• Scientific computing

• Mission-critical applications

• Higher IC density

• Additional error correction circuitry

Non-ECC Memory

Non-ECC memory is typically installed in:

• Desktop computers

• Gaming systems

• Consumer laptops

• Office computers

Although both remain recyclable, ECC modules often qualify for higher classifications because of their additional electronic components.

RDIMM vs UDIMM

RDIMM (Registered DIMM)

Registered DIMMs contain an additional register chip that buffers communication between the memory controller and memory chips.

Advantages include:

• Improved electrical stability

• Larger memory capacity

• Better reliability

• Enterprise applications

RDIMM modules are commonly classified as RAM-S.

UDIMM (Unbuffered DIMM)

Unbuffered DIMMs connect memory chips directly to the processor.

Typical applications include:

• Consumer desktops

• Office PCs

• Gaming computers

• Small workstations

Most UDIMM modules fall within RAM-A.

SO-DIMM vs DIMM

Memory modules are also classified according to physical size.

DIMM

DIMM (Dual Inline Memory Module) is the standard desktop and server memory format.

Common applications:

• Desktop computers

• Servers

• Workstations

SO-DIMM

SO-DIMM (Small Outline DIMM) is a compact version designed for portable devices.

Typical products:

• Laptops

• Mini PCs

• Embedded systems

• Industrial computers

Within the Ohata system, module size alone does not determine grade. Both DIMM and SO-DIMM products may qualify for RAM-A or RAM-S depending on their engineering characteristics.

Major Manufacturers

The Ohata RAM Classification System evaluates engineering characteristics rather than manufacturer names. However, many well-known companies produce memory modules commonly encountered during recycling.

Major manufacturers include:

• Samsung

• SK hynix

• Micron

• Kingston

• Crucial

• Corsair

• G.Skill

• ADATA

• Transcend

• Patriot

• TeamGroup

• HPE (Hewlett Packard Enterprise)

• Dell

• IBM

• Lenovo

• Cisco

• Oracle

• Supermicro

• Intel

• Fujitsu

Although these manufacturers produce different product lines, similar modules generally receive the same Ohata classification when their physical characteristics match.

RAM Identification Guide

RAM modules can usually be identified quickly through visual inspection.

Important identification features include:

• Gold-plated edge connectors

• Number of memory ICs

• Single-sided or double-sided construction

• Presence of ECC register chip

• Heat spreaders

• PCB thickness

• Module length

• Form factor

• Manufacturer labels

• Connector notch position

• Overall component density

Qualified inspectors evaluate the complete module rather than relying on a single feature.

Common Misclassification

Several mistakes occur frequently during RAM sorting.

Mistake 1

Classifying server ECC memory as ordinary desktop RAM.

This reduces purchasing accuracy because enterprise modules generally contain additional integrated circuits.

Mistake 2

Mixing shielded gaming RAM with standard gold finger RAM.

Metal heat spreaders increase weight while contributing relatively little recoverable electronic value.

Mistake 3

Mixing damaged RAM with complete modules.

Broken boards reduce processing efficiency and should be sorted separately.

Mistake 4

Assuming DDR5 is automatically worth more than DDR3.

The Ohata Classification System evaluates engineering characteristics and recoverable materials rather than memory generation alone.

Mistake 5

Confusing blank PCBs with complete memory modules.

Blank boards contain significantly fewer recoverable materials and belong in RAM-D.

Part 3 – Technical Reference (Buying Guide and Recycling Process)

Buying Guide

The Ohata RAM Scrap Classification System provides a engineering-based framework for purchasing memory modules used in desktop computers, laptops, enterprise servers, workstations, networking equipment, and industrial electronics. The purpose of these buying Guide is to improve consistency, transparency, and efficiency throughout the electronic recycling process.

Unlike reusable computer hardware markets, the Ohata RAM Classification System evaluates modules primarily according to their physical construction and recoverable material content rather than memory capacity, operating speed, or original retail value. Every module is visually inspected before classification to determine its appropriate grade.

During inspection, buyers typically evaluate:

• Overall physical condition

• Module completeness

• Integrated circuit density

• Gold finger quality

• PCB construction

• Presence of heatsinks or shields

• Server or consumer application

• Contamination

• Physical damage

• Mixed material content

Current reference categories include RAM-S, RAM-A, RAM-B, RAM-C, and RAM-D, each representing different levels of recoverable material and processing requirements. Reference buying prices are published separately and may be revised periodically according to market conditions.

Components That Reduce Purchasing Value

Several conditions may reduce the purchasing value of RAM modules.

Common examples include:

• Large aluminum heatsinks

• Decorative metal shields

• Broken PCB

• Missing memory ICs

• Heavy corrosion

• Burn damage

• Water damage

• Glue or excessive adhesive

• Plastic attachments

• Mixed electronic waste

• Contamination

• Bent connector edges

• Trimmed gold fingers

• Labels covering connectors

Whenever possible, suppliers should remove unnecessary metal covers, separate damaged modules, and sort memory according to the Ohata RAM grades before delivery. Proper preparation improves inspection efficiency, produces cleaner recycling streams, and supports more accurate purchasing throughout the Ohata RAM Scrap Classification System.

Complete vs. Incomplete RAM

Complete RAM modules generally retain their original electronic components and provide the greatest recycling value.

A complete RAM module typically includes:

• Original PCB

• All memory ICs

• Gold-plated edge connector

• SPD/EEPROM controller (where applicable)

• Factory-installed passive components

• No major physical damage

Incomplete RAM may include:

• Missing memory chips

• Broken PCB

• Missing connector sections

• Burned components

• Removed integrated circuits

• Severe corrosion

Incomplete modules often require additional processing and may qualify for lower classifications depending on their condition.

Heatsink Removal

Many modern gaming and high-performance memory modules are equipped with aluminum or steel heat spreaders.

Although these improve thermal performance during computer operation, they contribute relatively little to recoverable precious metal content while increasing transportation weight and processing labor.

Whenever practical, suppliers are encouraged to remove:

• Aluminum heat spreaders

• Decorative metal covers

• Plastic cosmetic shields

• Large mounting accessories

Removing these items before delivery helps improve inspection efficiency and allows modules to be classified more accurately under the Ohata RAM Classification System.

Mixed Loads

RAM should be sorted separately whenever possible.

Mixing server memory, desktop memory, damaged modules, blank PCBs, and shielded RAM into one container increases inspection time and reduces purchasing efficiency.

Recommended sorting includes:

• RAM-S

• RAM-A

• RAM-B

• RAM-C

• RAM-D

Well-organized material streams improve inventory management while helping downstream refiners process more consistent electronic scrap.

Part 4 - Recognition Process (AI Recognition Workflow and Public Identification Suggestion)

AI Recognition Workflow

Artificial intelligence increasingly assists recyclers in identifying electronic scrap.

Within the Ohata RAM Classification System, AI functions as a decision-support tool rather than a replacement for qualified inspection.

A typical AI workflow includes:

Step 1 — Image Capture

High-resolution photographs are captured from both sides of the memory module.

Step 2 — Object Detection

AI locates:

• PCB outline

• Gold fingers

• Memory ICs

• Register chips

• Heat spreaders

• Labels

• Connectors

Step 3 — Feature Analysis

The system evaluates:

• IC density

• Single-sided or double-sided construction

• Presence of ECC register chips

• Gold finger condition

• PCB dimensions

• Module type

Step 4 — Preliminary Classification

The AI estimates whether the module resembles:

• RAM-S

• RAM-A

• RAM-B

• RAM-C

• RAM-D

Step 5 — Human Verification

Final grading is always confirmed by trained personnel because photographs cannot reliably detect hidden damage, missing internal layers, contamination, or previous repairs.

Image Identification Guide

Visual inspection remains one of the most effective methods for identifying RAM.

Inspectors generally examine the following characteristics:

Gold Fingers

• Clean gold plating

• Trimmed connector

• Silver/tin connector

• Excessive wear

Memory IC Count

• Four chips

• Eight chips

• Sixteen chips

• Double-sided configuration

Higher semiconductor density generally indicates higher recoverable material content.

Register Chip

Server ECC Registered RAM usually contains an additional register controller positioned near the center of the module.

Heat Spreaders

Determine whether metal shields are installed.

Form Factor

Identify:

• DIMM

• SO-DIMM

PCB Construction

Observe:

• PCB thickness

• Surface finish

• Component density

• Overall manufacturing quality

These visible engineering characteristics support consistent public identification.

Public Identification Guide

The Ohata RAM Scrap Classification System is intended to provide practical public guidance for identifying common RAM modules using visible engineering characteristics.

Public identification typically considers:

• Module size

• Gold finger construction

• Integrated circuit density

• Presence of ECC register chips

• Heat spreaders

• PCB quality

• Module completeness

• Surface-mounted component layout

• Server versus consumer application

These guide are intended for identification and educational purposes. Final purchasing classifications are confirmed through physical inspection and may consider additional engineering factors not visible in photographs.

Official Ohata RAM Scrap Classification Disclaimer

The Ohata RAM Scrap Classification System is an internal engineering-based classification developed by Ohata Shoji Inc. and affiliated Ohata companies to assist in the identification, sorting, purchasing, and recycling of computer memory modules. The system is intended to promote consistent grading by evaluating measurable physical characteristics, including PCB construction, integrated circuit density, gold finger condition, module completeness, recoverable material content, and intended application.

This classification system is not an international industry standard, government regulation, certification program, or universally adopted recycling specification. Product names, manufacturer names, memory technologies, and equipment examples are provided solely for public identification and educational purposes. Similar products from different manufacturers may receive the same classification when their engineering characteristics are substantially similar.

Published buying prices are reference values only and may be revised without prior notice in response to changes in precious metal markets, downstream refining requirements, technological developments, or internal purchasing policies. Final classification, acceptance, and payment are determined only after physical inspection by authorized Ohata personnel.

The information contained within the Ohata RAM Scrap Classification Wiki is intended to assist suppliers, recyclers, businesses, and the general public in identifying common RAM modules. While every effort is made to maintain technical accuracy, Ohata.ai wiki . does not guarantee that every model, revision, or manufacturing variation will correspond exactly to the examples presented. Individual modules may vary because of production changes, regional versions, repair history, missing components, or physical condition.

All trademarks, product names, logos, and manufacturer names remain the property of their respective owners and are used solely for descriptive identification. Their inclusion does not imply endorsement, sponsorship, affiliation, or partnership with Ohata Shoji Group.

The Ohata RAM Scrap Classification Wiki is reviewed and updated periodically to reflect changes in computer memory technology, recycling practices, and Ohata purchasing condition. Users should refer to the most current published edition when identifying RAM modules or confirming current buying requirements.