Technical Snapshot

The SK hynix 128GB DDR5-6400 RDIMM (HMCT04MHBRC) is a server-grade DDR5 RDIMM memory module designed for enterprise servers and workstations. Running at 6,400 MT/s with CL52 timings at 1.1V, The module provides 128GB 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 RDIMM (HMCT, 32Gb M-die)
SK HYNIX
SK Hynix RAM
SK Hynix DDR5 RDIMM (HMCT, 32Gb M-die)

SK hynix 128GB DDR5-6400 RDIMM (HMCT04MHBRC)

DDR5 · RDIMM · 6,400 MT/s · 128GB

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 128GB
CAS Latency — the delay between a memory access request and data availability.
Latency CL52
Operating voltage. Higher voltage allows faster speeds but increases power and heat.
Voltage 1.1V
MPNHMCT04MHBRC
CategoryMemory
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Memory Specifications

Memory TypeDDR5
Form FactorRDIMM
Total Capacity128GB
Speed6,400 MT/s
CAS LatencyCL52
Voltage1.1V
ECCYes

Full Specifications

Data sourced from SK Hynix product specifications
Memory
Product LineDDR5 RDIMM (HMCT, 32Gb M-die)
Memory TypeDDR5
Form FactorRDIMM
Total Capacity128GB
Module Count1
Module Capacity128GB
Speed6,400 MT/s
Timings & Voltage
CAS LatencyCL52
Voltage1.1V
ECCYes
Design
IC Type32Gb M-die x4
Product
BrandSK Hynix
MPNHMCT04MHBRC
Variant2Rx4
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 128GB DDR5-6400 RDIMM (HMCT04MHBRC) DatasheetPDF · Technical specifications
SK Hynix Support →
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Frequently Asked Questions

What systems is this memory compatible with?

The SK hynix 128GB DDR5-6400 RDIMM (HMCT04MHBRC) 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 128GB DDR5-6400 RDIMM (HMCT04MHBRC) runs at 6,400 MT/s with CL52 timings. This is a JEDEC standard speed that works automatically without BIOS configuration.

Can I add more memory later?

Yes, the SK hynix 128GB DDR5-6400 RDIMM (HMCT04MHBRC) is a single 128GB 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 128GB DDR5-6400 RDIMM (HMCT04MHBRC) 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 128GB DDR5-6400 RDIMM (HMCT04MHBRC).

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