Technical Snapshot

The SK hynix 256GB DDR5-6400 3DS RDIMM (HMCT14AHERA) is a server-grade DDR5 RDIMM memory module designed for enterprise servers and workstations. Running at 6,400 MT/s, The module provides 256GB of DDR5 memory . this module targets server deployments, virtualization hosts, and high-availability computing environments requiring ECC error correction.

Use Case
Server deployments, virtualization, high-availability computing
Compatibility
RDIMM-compatible server motherboard
Category
DDR5 RDIMM — SK Hynix DDR5 3DS RDIMM (HMCT, 16Gb A-die)
SK HYNIX
SK Hynix RAM
SK Hynix DDR5 3DS RDIMM (HMCT, 16Gb A-die)

SK hynix 256GB DDR5-6400 3DS RDIMM (HMCT14AHERA)

DDR5 · RDIMM · 6,400 MT/s · 256GB

Memory transfer rate in megatransfers per second. Higher MT/s provides more bandwidth for CPU-bound workloads.
Speed 6,400 MT/s
Total kit capacity across all modules. Dual-channel kits double memory bandwidth.
Capacity 256GB
Operating voltage. Higher voltage allows faster speeds but increases power and heat.
Voltage 1.1V
DDR generation. DDR5 offers higher bandwidth and capacity than DDR4, but requires a DDR5-compatible motherboard.
Type DDR5
MPNHMCT14AHERA
CategoryMemory
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Memory Specifications

Memory TypeDDR5
Form FactorRDIMM
Total Capacity256GB
Speed6,400 MT/s
Voltage1.1V
ECCYes

Full Specifications

Data sourced from SK Hynix product specifications
Memory
Product LineDDR5 3DS RDIMM (HMCT, 16Gb A-die)
Memory TypeDDR5
Form FactorRDIMM
Total Capacity256GB
Module Count1
Module Capacity256GB
Speed6,400 MT/s
Timings & Voltage
Voltage1.1V
ECCYes
Design
IC Type16Gb A-die x4
Product
BrandSK Hynix
MPNHMCT14AHERA
Variant8Rx4 (4H 3DS)
Physical
Weight0.045 kg
Package Dimensions39.37 x 35.56 x 30.48 cm

Support

SK Hynix Memory Compatibility ToolCheck motherboard compatibility for this module
SK Hynix Support →
SK hynix 256GB DDR5-6400 3DS RDIMM (HMCT14AHERA) DatasheetPDF · Technical specifications
SK Hynix Support →
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Frequently Asked Questions

What systems is this memory compatible with?

The SK hynix 256GB DDR5-6400 3DS RDIMM (HMCT14AHERA) is RDIMM server memory with ECC error correction. It requires a server or workstation motherboard with RDIMM support. NOT compatible with standard desktop motherboards. Check your server's QVL (Qualified Vendor List) for compatibility.

What speed does this memory run at?

The SK hynix 256GB DDR5-6400 3DS RDIMM (HMCT14AHERA) runs at 6,400 MT/s. This is a JEDEC standard speed that works automatically without BIOS configuration.

Can I add more memory later?

Yes, the SK hynix 256GB DDR5-6400 3DS RDIMM (HMCT14AHERA) is a single 256GB module. You can add additional compatible DDR5 RDIMM modules to populate empty slots. For best performance, use matched modules of the same speed and capacity to enable dual-channel mode.

Does this memory support ECC error correction?

Yes, the SK hynix 256GB DDR5-6400 3DS RDIMM (HMCT14AHERA) includes ECC (Error-Correcting Code) support, which detects and corrects single-bit memory errors. This is essential for servers, workstations, and mission-critical applications where data integrity is paramount.

Where can I find technical support?

Visit the SK Hynix support website for compatibility tools, firmware updates, and technical documentation for the SK hynix 256GB DDR5-6400 3DS RDIMM (HMCT14AHERA).

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MPN: HMCT14AHERA
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