4X77A77495: Lenovo ThinkSystem 32GB TruDDR5 4800MHz (1Rx4 1.1V) RDIMM

Also listed as: 4X77A77495-01, SP47A77495, BNFC, M321R4GA3BB0-CQK, 03GX084 · made by Samsung

The Lenovo 4X77A77495 is a 32GB single-rank (1Rx4) TruDDR5 registered memory module operating at 4800MHz with an efficient 1.1V operating voltage. Designed specifically for Lenovo ThinkSystem V3 servers powered by 4th Gen Intel Xeon Scalable (Sapphire Rapids) and AMD EPYC 9004 Series processors, it features integrated Power Management ICs (PMIC) and on-die ECC for superior signal integrity and fault tolerance under high-density multi-channel configurations. The module embeds Lenovo TruDDR5 cryptographic authentication microcode. In the secondary and surplus market, it is heavily traded for Gen5 server deployments. Buyers should verify genuine Lenovo holographic markings.

Specifications

About the 4X77A77495

4X77A77495 is Lenovo's entry enterprise 32GB single-rank DDR5-4800 registered ECC memory module introduced with the ThinkSystem V3 generation. Built for 4th Gen Intel Xeon Scalable (Sapphire Rapids) and AMD EPYC 9004 (Genoa) platforms, it operates at a low 1.1V standard operating voltage while doubling per-channel bandwidth over DDR4. It succeeded the V2 generation DDR4-3200 memory tier. The module is primarily selected for high-frequency compute clusters, single-DIMM-per-channel baseline server builds, and cost-optimized virtualization nodes.

Compatibility

The RDIMM fits Lenovo ThinkSystem V3 servers including the SR650 V3, SR630 V3, SR665 V3, SR645 V3, ST650 V3, and SR850 V3. It requires an Intel 4th Gen Xeon or AMD EPYC 9004 series CPU socket. It cannot be installed in ThinkSystem V1 or V2 servers, as DDR5 uses an entirely different keying position and on-module PMIC architecture incompatible with DDR4 slots. The most common configuration issue is combining 1Rx4 modules with 2Rx4 or 4Rx4 modules on the same memory channel, which forces the memory controller to downclock or fail POST.

How to identify a genuine unit

Genuine modules carry a Lenovo serialized label listing option part number 4X77A77495, FRU part number SP47A77495, and feature code BNFC. Beneath the label is an OEM module from Samsung (M321R4GA3BB0-CQK), Micron, or SK hynix programmed with Lenovo TruDDR5 signature data. During boot, Lenovo XClarity Administrator and UEFI report the module as authenticated TruDDR5. Generic retail modules will function but trigger a non-genuine memory notification in XCC event logs and disable Lenovo memory tuning profiles.

Buying used

Verify that all 288 gold pins are free of scratches, residue, or solder burns caused by improper insertion into latching sockets. Request confirmation that the onboard PMIC has not suffered thermal stress and that the module passes UEFI memory self-tests cleanly without logging multi-bit errors. Check whether the seller supplies original Lenovo packaging or anti-static blister packs. Bare pulled modules should be priced with a discount reflecting lack of vendor warranty.

Reference prices (last 14 days, updated 2026-10-27)

Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.

Fits these models

• Lenovo ThinkSystem SR650 V3
• Lenovo ThinkSystem SR630 V3
• Lenovo ThinkSystem SR665 V3
• Lenovo ThinkSystem SR645 V3
• Lenovo ThinkSystem ST650 V3
• Lenovo ThinkSystem SR850 V3

Equivalent part numbers

• HPE P43322-B21 HPE 32GB 1Rx4 DDR5-4800 SmartMemory RDIMM

FAQ

Sources

• Lenovo ThinkSystem SR650 V3 Server Product Guide - Memory Options, checked 2026-10-27