4X77A81436: lenovo ThinkSystem 64GB TruDDR5 5600MHz (2Rx4) RDIMM
Also listed as: 4X77A81436-01, 03GX089, SP47A81436, BV4D, M321R8GA0PB0-CWM
64GB dual-rank DDR5-5600 registered ECC memory module delivering massive capacity and high bandwidth for enterprise ThinkSystem V3 servers.
Specifications
| Part number | 4X77A81436 |
|---|---|
| Brand | lenovo |
| Type | Memory |
| Other numbers | 4X77A81436-01, 03GX089, SP47A81436, BV4D, M321R8GA0PB0-CWM |
| Type | DDR5 |
| Capacity (GB) | 64 |
| Speed mhz | 5,600 |
| Form factor | RDIMM |
| Rank | 2Rx4 |
| Voltage | 1.1 |
| Ecc | Yes |
About the 4X77A81436
The Lenovo 4X77A81436 is an enterprise-tier 64GB dual-rank DDR5-5600 registered ECC memory option. Designed for virtualization hosts, large SQL and SAP database instances, and AI model pre-processing nodes, it delivers exceptional capacity and transfer rates of up to 5600 MT/s. It succeeded initial 4800MHz 64GB RDIMMs to leverage Emerald Rapids and Genoa/Bergamo processor memory controller improvements.
Compatibility
Built specifically for Lenovo ThinkSystem V3 servers, including SR650 V3, SR630 V3, SR665 V3, SR645 V3, and ST650 V3 models. Depending on population rules and processor support, it runs at 5600 MT/s in 1 DPC arrangements and scales reliably across all available memory channels. It cannot be used in DDR4-based ThinkSystem V1 or V2 servers.
How to identify a genuine unit
Distinguished by the Lenovo TruDDR5 inventory label reading option code 4X77A81436, FRU number 03GX089, and feature code BV4D. Built using dual-rank 16Gb or 24Gb DDR5 DRAM components with onboard PMIC circuitry. In system management utilities, the module registers with genuine Lenovo firmware signatures and complete SPD environmental sensor reporting.
Buying used
When purchasing used 64GB DDR5 RDIMMs, examine the PMIC heat dissipation area for evidence of excessive heat or component displacement. Ensure that the card edge pins are clean and free from scratches. Run full-length memory diagnostic cycles under operating thermal load to ensure error-free operation at the full 5600 MT/s rating.
Reference prices (last 12 months, updated 2026-10-20)
New: USD 340 (1 sighting, Sep 2026)
Refurbished: USD 285 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| ServerMonkey | refurbished | USD 285 | Tested working pull | 2026-10-20 |
| Provantage | new | USD 340 | Factory sealed Lenovo option kit | 2026-09-28 |
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
Buying or selling 4X77A81436?
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.
Sources
- Lenovo Technical Reference - 4X77A81436, checked 2026-10-27
- Lenovo Technical Reference - 4X77A81436, checked 2026-10-27