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7X77A01304: Lenovo ThinkSystem 32GB TruDDR4 2666MHz (2Rx4 1.2V) RDIMM

Lenovo 7X77A01304 Memory2666 MT/s
LenovoMemory

Also listed as: 01KP642, AUMW, M393A4K40BB2-CTD, SP40M56471, 01KP643 · made by Samsung

The Lenovo 7X77A01304 is a high-density 32GB dual-rank DDR4-2666MHz ECC registered memory module designed for ThinkSystem V1 servers. Built with high-grade Samsung DRAM silicon and programmed with Lenovo TruDDR4 firmware, it enables optimal memory performance and advanced diagnostics in XClarity Controller. Operating at 1.2V across six memory channels per processor, it allows configurations up to 768GB per socket on 2U rack servers. Second-hand purchasers should check the module's SPD authenticity and inspect the circuit traces for physical damage.

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Specifications

Part number7X77A01304
BrandLenovo
Made bySamsung
TypeMemory
Other numbers01KP642, AUMW, M393A4K40BB2-CTD, SP40M56471, 01KP643
Statuscurrent
Capacity32GB
TypeDDR4-2666 Registered DIMM (RDIMM)
Speed2666 MT/s (PC4-21300)
Voltage1.2V
RankDual Rank (2Rx4)
Generation fitThinkSystem V1 servers (Intel Xeon Scalable 1st & 2nd Gen)

About the 7X77A01304

7X77A01304 is Lenovo's workhorse 32GB TruDDR4 2666MHz registered SDRAM DIMM for first-generation ThinkSystem V1 servers. Configured in a dual-rank x4 organization (2Rx4) operating at 1.2V, it provides the ideal capacity balance for large virtual machines, database buffers, and high-performance computing nodes.

Compatibility

Fully compatible with Lenovo ThinkSystem rack, tower, and dense servers including SR650, SR630, SR530, SR850, SR950, ST550, and SD530. Supports Intel Xeon Scalable Bronze, Silver, Gold, and Platinum processors. Can be populated across all 24 DIMM slots on a 2-socket server to reach 768GB RAM.

How to identify a genuine unit

The green RDIMM board bears a white Lenovo option label indicating part number 7X77A01304, FRU part number 01KP642, and feature code AUMW. OEM chips display Samsung M393A4K40BB2-CTD markings. System management tools verify authentic TruDDR4 cryptographic signatures during POST.

Buying used

Inspect edge fingers for gold wear or solder bridging. Ensure that all DRAM packages and the register clock driver (RCD) chip show no physical cracking or overheating discoloration. Verify in UEFI setup that the module operates error-free at its full 2666 MT/s rated speed without downclocking.

Reference prices (last 12 months, updated 2026-10-27)

Used: USD 55 (1 sighting, Oct 2026)

All sightings
SellerConditionPriceNoteSeen
ebay.comusedUSD 55Tested working genuine Lenovo TruDDR4 32GB 2666MHz RDIMM2026-10-27

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

Fits these models

Check compatibility with Lenovo

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Lenovo has tested with the Lenovo 7X77A01304.

Equivalent part numbers

FAQ

What is the rank configuration of the 7X77A01304 module?

It is configured as a dual-rank x4 (2Rx4) registered memory module.

What is the Lenovo FRU replacement part number for this module?

The field replaceable unit (FRU) part number is 01KP642.

Buying or selling 7X77A01304?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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