SK hynix HMCG88AEBRA107N BB 64GB (2x32GB) DDR5-4800 PC5-38400 2Rx8 ECC RDIMM – New Open BoxItem Introduction
Offered for sale is a brand-new, open-box set of two (2) SK hynix HMCG88AEBRA107N BB 32GB DDR5-4800 ECC Registered DIMM (RDIMM) memory modules, providing a combined memory capacity of 64GB.
Manufacturer: SK hynix
Part Number: HMCG88AEBRA107N BB
Condition: New – Open Box
Quantity Included: Two (2) Memory Modules
Capacity per Module: 32GB
Total Capacity: 64GB (2 × 32GB)
These are brand-new, open-box units, offering high-capacity enterprise memory for compatible DDR5 servers and professional workstations without requiring a purchase of individually packaged retail modules.
The SK hynix HMCG88AEBRA107N is a server-class DDR5 memory module designed for systems supporting ECC Registered DDR5 RDIMM memory. Each module provides 32GB of DDR5 SDRAM capacity, operating at a rated transfer speed of 4800 MT/s, corresponding to the PC5-38400 bandwidth designation.
Each module features a 2Rx8 dual-rank organization, ECC error-correction capability, Registered DIMM architecture, and a standard 288-pin DDR5 RDIMM form factor.
With two matching 32GB modules included, this set provides 64GB of total system memory capacity, making it an excellent option for compatible enterprise server upgrades, workstation memory expansion, virtualization environments, database servers, and other memory-intensive computing applications.
Advanced DDR5 Memory Technology
DDR5 represents a significant architectural advancement over DDR4, introducing higher memory transfer rates, improved data-access efficiency, and updated power-management technologies.
At its rated speed of 4800 MT/s, each module provides approximately 38.4 GB/s of theoretical peak data bandwidth across its 64-bit data payload.
DDR5 also introduces a dual-subchannel architecture that allows memory transactions to be handled more efficiently than the traditional single-channel organization used within DDR4 DIMMs.
ECC Error-Correcting Memory
These modules support ECC (Error-Correcting Code), a key feature of enterprise computing environments where data integrity and system stability are especially important.
ECC allows a compatible memory controller to detect and correct certain memory errors, reducing the likelihood of undetected data corruption during critical workloads.
Registered DIMM Architecture
Unlike conventional desktop DDR5 memory, these modules use a Registered DIMM (RDIMM) architecture.
Registered memory incorporates specialized circuitry that buffers command and address signals between the system's memory controller and DRAM devices.
This reduces electrical loading on the memory controller and supports the high-capacity memory configurations commonly found in enterprise servers and professional workstation platforms.
Dual-Rank 2Rx8 Organization
Each module features a 2Rx8 memory organization, indicating two ranks constructed from x8-organized DRAM devices.
Rank organization is an important consideration when replacing or expanding server memory because modules with identical capacities and speeds may still have different internal architectures.
Genuine SK hynix Enterprise Memory
SK hynix is a major global semiconductor manufacturer and a leading supplier of DRAM products used throughout the computing industry.
Its memory products are widely used in enterprise servers, OEM workstations, and data-center infrastructure.
These modules provide a practical solution for compatible systems requiring DDR5-4800 ECC Registered memory with 32GB capacity per DIMM.
Item FeaturesBrand-New, Open-Box Condition
Both memory modules are offered in brand-new, open-box condition.
The original packaging has been opened or is not factory-sealed.
This listing is for the two memory modules described, without any representation that retail packaging, installation accessories, or additional components are included.
Complete Matching Set of Two
This listing includes two matching SK hynix HMCG88AEBRA107N BB memory modules.
Each module features:
32GB capacity
DDR5 SDRAM
DDR5-4800 speed
PC5-38400 bandwidth class
ECC Registered architecture
2Rx8 dual-rank organization
288-pin RDIMM form factor
CL40 CAS latency
1.1V nominal DRAM operating voltage
Total Capacity: 64GB
64GB Combined Memory Capacity
The two included modules provide:
2 × 32GB = 64GB
This memory capacity is suitable for numerous professional and enterprise applications, hosting
Enterprise applications
Scientific computing
Engineering workstations
Data analytics
Software development
Cloud infrastructure
Storage systems
Memory-intensive professional workloads
Actual usable memory and supported memory configurations depend on the host system.
32GB Capacity per Module
Each module provides:
32GB DDR5 SDRAM
High-capacity modules allow compatible systems to achieve substantial total memory capacity while using fewer DIMM slots.
For example, compatible systems using 32GB modules can potentially support:
These examples illustrate capacity calculations only. Actual maximum supported memory depends on the processor, motherboard, server architecture, and DIMM population requirements.
DDR5-4800 Performance
Each module is rated for:
DDR5-4800
with an effective data transfer rate of:
4800 MT/s
DDR5-4800 is also frequently marketed as 4800MHz memory, although MT/s is the technically accurate unit for effective data transfer rate.
Actual operating speed depends on the processor, motherboard, BIOS/firmware, and memory configuration.
PC5-38400 Bandwidth
The modules belong to the:
PC5-38400
performance class.
This designation corresponds to approximately:
38.4 GB/s of theoretical peak bandwidth per module
across the 64-bit data payload.
This is a theoretical bandwidth calculation rather than a guaranteed real-world transfer rate.
DDR5 Dual-Subchannel Architecture
DDR5 DIMMs incorporate two independently addressable subchannels.
For DDR5 ECC RDIMMs, each subchannel includes:
32 data bits
8 additional ECC bits
This results in an aggregate module width of:
64 data bits + 16 ECC bits = 80 bits
The dual-subchannel architecture helps improve the efficiency of memory access and transaction handling.
ECC Error Correction
Each module supports:
ECC – Error-Correcting Code
ECC memory provides additional protection against certain memory errors when used with a compatible memory controller.
ECC is particularly valuable in environments where undetected errors could affect:
ECC does not eliminate every possible hardware failure or memory error.
Registered DIMM Architecture
Each module is a:
Registered DIMM (RDIMM)
Registered memory buffers command and address signals between the memory controller and DRAM devices.
This architecture is commonly used in enterprise systems requiring:
High memory capacities
Multiple DIMMs per processor
Large DIMM memory configurations
Reduced command/address electrical loading
These modules are not standard consumer desktop UDIMMs.
Dual-Rank 2Rx8 Configuration
Each module features:
2Rx8
This means:
2R: Two memory ranks
x8: DRAM devices organized with an 8-bit data width
Rank organization can affect memory compatibility, population requirements, and achievable operating speeds.
Matching rank organization can be beneficial when expanding an existing server configuration.
CL40 CAS Latency
The modules are specified with:
CL40 CAS Latency
CAS latency represents the number of memory clock cycles associated with a column-read operation.
At DDR5-4800, the underlying memory clock is 2400MHz.
A CL40 timing corresponds to approximately 16.7 nanoseconds of nominal CAS latency, excluding other delays within the memory subsystem.
Actual application latency depends on the complete platform configuration.
1.1V Nominal DRAM Voltage
Each module operates at a nominal DRAM voltage of:
1.1V
DDR5 incorporates updated power-management architecture and a lower nominal DRAM supply voltage than DDR4.
Actual module power consumption depends on the workload and system configuration.
DDR5 Power-Management Architecture
DDR5 RDIMMs incorporate updated power-management technology, including on-module power regulation.
This supports the power distribution and regulation requirements of DDR5 memory.
288-Pin DDR5 RDIMM Form Factor
Each module uses a:
288-pin DDR5 Registered DIMM form factor
Although DDR4 full-size DIMMs also use 288 contacts, DDR4 and DDR5 are electrically and mechanically different memory generations.
They are not interchangeable.
Suitable for Enterprise Servers
These modules are intended for compatible DDR5 enterprise server platforms.
Potential uses include:
Suitable for Professional Workstations
These modules may also be used in compatible professional workstation platforms that explicitly support DDR5 ECC Registered memory.
Potential applications simulation
Scientific computing
Professional rendering
Software development
Data analytics
Computational modeling
High-memory workstation workloads
Compatibility must be confirmed for the specific workstation.
Virtualization Applications
Large amounts of physical memory are particularly useful for virtualization.
Compatible systems using these modules may support hypervisors such as:
VMware ESXi
Microsoft Hyper-V
Proxmox memory capacity can influence the number and size of virtual machines a host can operate simultaneously.
Actual virtualization performance depends on the complete system.
Database and Enterprise ComputingThe 64GB combined capacity can be useful in compatible systems running memory-intensive applications.
Potential benefits of additional system memory include:
Larger database caches
Reduced reliance on disk-based swapping
Improved support for concurrent applications
Increased available memory for virtual machines
Greater capacity for in-memory workloads
The actual performance benefit depends on the workload and existing system configuration.
Item SpecificationsGeneral hynixBrandSK hynix / HynixManufacturer Part NumberHMCG88AEBRA107NComplete Module IdentificationHMCG88AEBRA107N BBProduct TypeServer / Workstation MemoryMemory TechnologyDDR5 SDRAMModule TypeRegistered DIMMForm – Open BoxQuantity Included2 ModulesCapacity per Module32GBTotal Capacity64GBPerformance GenerationDDR5Rated SpeedDDR5-4800Effective Data Rate4800 MT/sCommon Marketing Speed4800MHzPC RatingPC5-38400JEDEC Speed ClassPC5-4800BTheoretical Peak Bandwidth38.4 GB/s per moduleCAS LatencyCL40Nominal DRAM Voltage1.1VMemory ArchitectureSpecificationDetailsMemory TypeDDR5 SDRAMECC SupportYesBuffering TypeRegisteredModule ArchitectureRDIMMRank Configuration2Rx8Number of Ranks2DRAM Device Organizationx8DDR5 Subchannels2Data Width per Subchannel32 bitsECC Width per Subchannel8 bitsTotal Data Width64 bitsTotal Width Including ECC80 bitsPhysical and Electrical SpecificationsSpecificationDetailsForm FactorFull-Size DIMMPin Count288Memory GenerationDDR5Nominal DRAM Voltage1.1VInstallation TypeInternal DIMM SocketIntended PlatformsCompatible DDR5 ECC RDIMM Servers / WorkstationsCoolingRequires Appropriate System AirflowIncluded ItemsItemQuantitySK hynix HMCG88AEBRA107N BB 32GB DDR5-4800 ECC RDIMM2Total Modules2Combined Capacity64GBOnly the two memory modules are included. No additional hardware, software, or accessories are represented as included.
Important Compatibility InformationDDR5 ECC Registered MemoryThese modules are:
DDR5 ECC Registered RDIMMs
They require a processor and motherboard or server platform that specifically supports DDR5 Registered memory.
They are not conventional consumer desktop DDR5 memory modules.
Not Compatible With DDR4 SystemsThese are DDR5 modules.
They cannot be installed in DDR4 memory sockets.
DDR4 and DDR5 are different memory generations with different electrical architectures and physical keying.
RDIMM vs. UDIMMThese modules are:
RDIMM – Registered DIMM
They are not:
UDIMM – Unbuffered DIMM
Most consumer desktop DDR5 motherboards support UDIMMs rather than RDIMMs.
A system must explicitly support Registered DIMMs to use these modules.
RDIMM vs. LRDIMMThese are conventional DDR5 Registered DIMMs.
They are not Load-Reduced DIMMs.
RDIMM and LRDIMM memory architectures should not be assumed interchangeable or mixable within the same system.
Memory Speed CompatibilityThe modules are rated for:
4800 MT/s
However, the actual operating speed depends on the host platform.
Factors affecting memory speed include:
Processor memory-controller limitations
Motherboard version
Number of installed DIMMs
Number of populated memory channels
DIMMs per channel
Existing memory configurations
Server population rules
A compatible system may operate these modules below their rated DDR5-4800 speed.
Memory Population RequirementsEnterprise server platforms often have specific memory installation requirements.
These may depend on:
Consult the system manufacturer's memory installation documentation before purchasing.
Matching Existing MemoryWhen expanding an existing memory configuration, verify more than just capacity and speed.
Important specifications include:
DDR5 memory generation
ECC capability
Registered architecture
32GB module capacity
DDR5-4800 speed
2Rx8 rank organization
Supported DRAM density
Processor memory-controller support
DIMM population requirements
OEM qualification requirements
Matching the complete manufacturer part number can be helpful when replacing or expanding existing server memory.
Platform CompatibilityThese modules are intended for compatible DDR5 server and professional workstation platforms.
Compatibility is not guaranteed solely because a motherboard supports DDR5.
The system must support:
32GB DDR5-4800 2Rx8 ECC Registered RDIMMs
Ideal ApplicationsThese SK hynix HMCG88AEBRA107N BB memory modules are particularly well suited for compatible systems used for:
Enterprise servers
Professional hosts
VMware ESXi environments
Microsoft Hyper-V
Proxmox VE
KVM virtualization
Database hosting
Data-center infrastructure
Cloud computing
Scientific computing
Engineering simulations
Enterprise storage systems
Software development
Data analytics
Large-memory applications
Server memory upgrades
Replacement of matching DDR5 RDIMMs
Product SummaryManufacturer: SK hynix
Model / Part Number: HMCG88AEBRA107N BB
Condition: New – Open Box
Quantity Included: Two (2) Modules
Capacity per Module: 32GB
Total Capacity: 64GB
Memory Technology: DDR5 SDRAM
Speed: DDR5-4800 / 4800 MT/s
PC Rating: PC5-38400
JEDEC Speed Class: PC5-4800B
CAS Latency: CL40
Rank Configuration: 2Rx8
ECC: Yes
Registered: Yes
Module Type: RDIMM
Pin Count: 288
Nominal DRAM Voltage: 1.1V
This brand-new, open-box set of two SK hynix HMCG88AEBRA107N BB 32GB DDR5-4800 ECC Registered RDIMMs provides a combined 64GB of enterprise-class memory for compatible DDR5 servers and professional workstations.
Combining DDR5-4800 performance, PC5-38400 bandwidth, ECC error correction, Registered DIMM architecture, 2Rx8 dual-rank organization, CL40 latency, and 1.1V nominal operation, these modules are well suited for high-capacity enterprise computing environments.
THIS LISTING INCLUDES TWO (2) BRAND-NEW, OPEN-BOX SK HYNIX HMCG88AEBRA107N BB 32GB DDR5-4800 ECC REGISTERED MEMORY MODULES — 64GB TOTAL.
