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SK hynix DDR5 RDIMM server memory modules
Capacity
64 GB
Speed
DDR5-6400 MT/s
Organization
2Rx4, 16 Gb DRAM
ECC
Registered ECC (RDIMM)
SK hynixNew

SK hynix 64GB DDR5-6400 RDIMM · 2025

P/N4X77B07420 / 4X77B09788
In stockStock tier 50+
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Price and availability confirmed within one business day

  • Manufacturer channel supply
  • Ships from Dubai / Hong Kong
  • Commercial invoice, packing list, warranty docs
Datasheet

01Overview

A 64 GB DDR5-6400 registered ECC module supplied as Lenovo ThinkSystem option 4X77B07420 (TruDDR5 RDIMM-A v2) built on SK hynix DRAM per the equipment register. It is bought for Lenovo AMD EPYC V3 platforms such as the SR675 V3 GPU server, where 6400 MT/s memory feeds multi-GPU AI nodes.

Built for

  • Memory for Lenovo ThinkSystem SR675 V3 GPU servers and SD535 V3 nodes
  • High-bandwidth memory configurations for AI training and inference hosts
  • Replacing or matching existing 64 GB 2Rx4 6400 MT/s RDIMM-A modules

02Specifications

Technical specifications

Module

Lenovo option part number
4X77B07420Lenovo ThinkSystem option PN, feature code CA1L. 4X77B09788 (CBND) is the SR645 V3 / SR665 V3 variant
Lenovo description
ThinkSystem 64GB TruDDR5 6400MHz (2Rx4) RDIMM-A v2
Capacity
64 GB
Type
DDR5 registered DIMM (RDIMM-A, AMD platforms), ECC
Organization
2Rx4 (dual-rank, x4)
DRAM density
16 Gb
DRAM vendor
SK hynixFrom the equipment register; Lenovo does not publish the DRAM vendor for TruDDR5 options

Performance

Data rate
6400 MT/s
Voltage
1.1 V (DDR5 standard)

Compatibility

Supported servers (ServerProven)
ThinkSystem SD535 V3, SR675 V3 (4X77B07420); SR645 V3, SR665 V3 (4X77B09788)
Authentication
Lenovo TruDDR5 signature — verified by ThinkSystem firmware

03Requirements

Installation

  • Lenovo ThinkSystem AMD V3 server from the ServerProven list; the "-A" suffix marks AMD-platform RDIMMs
  • Mix only with DIMMs of the same capacity, rank and speed in a channel; follow the server population rules
  • Effective speed depends on CPU and DIMMs-per-channel; 6400 MT/s applies at 1 DPC on supported CPUs

In the box

Manufacturer retail or bulk packaging as supplied through the channel; contents confirmed on the order.

04Documents

Manufacturer

Warranty: Manufacturer warranty, details on quote

Supplied with every shipment

  • Commercial invoice and packing list
  • Manufacturer warranty registration documents
  • Certificate of origin on request
  • Serial numbers listed on the delivery note

05Related

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