4X77A77496: Lenovo ThinkSystem 64GB TruDDR5 4800MHz (2Rx4 1.1V) RDIMM
Also listed as: 4X77A77496-01, SP47A77496, BNFD, M321R8GA0BB0-CQK, 03GX085 · made by Samsung
The Lenovo 4X77A77496 is a 64GB dual-rank (2Rx4) TruDDR5 registered memory module operating at 4800MHz with 1.1V power consumption, engineered for Lenovo ThinkSystem V3 servers. Featuring an onboard Power Management IC (PMIC), dual independent 32-bit subchannels, and on-die error-correcting code (ECC), it is the primary high-capacity memory standard for virtualization hypervisors, heavy database workloads, and in-memory compute nodes. It includes Lenovo TruDDR5 signature microcode to enable verified timing profiles in UEFI and comprehensive thermal monitoring in XClarity. Buyers in the secondary market should verify the presence of Lenovo TruDDR5 labels.
Specifications
| Part number | 4X77A77496 |
|---|---|
| Brand | Lenovo |
| Made by | Samsung |
| Type | Memory |
| Other numbers | 4X77A77496-01, SP47A77496, BNFD, M321R8GA0BB0-CQK, 03GX085 |
| Status | current |
| Capacity (GB) | 64 |
| Speed | DDR5-4800 |
| Rank width | 2Rx4 |
| Generation fit | ThinkSystem V3 servers (SR650 V3, SR630 V3, SR665 V3, SR645 V3, ST650 V3, SR850 V3) |
About the 4X77A77496
4X77A77496 is Lenovo's high-capacity 64GB dual-rank DDR5-4800 registered memory module engineered for dense enterprise computing on ThinkSystem V3 systems. Operating at 4800 MT/s at 1.1V, it provides the ideal capacity point for memory-heavy cloud hypervisors, enterprise SAP HANA instances, and SQL databases. In Lenovo's V3 hierarchy, it sits above the 32GB single-rank module and below the costly 128GB 3DS RDIMM. It replaced the 64GB DDR4-3200 modules from the V2 server family.
Compatibility
This module is compatible with all Lenovo ThinkSystem V3 servers, including the dual-socket SR650 V3 and SR630 V3, four-socket SR850 V3, and AMD-based SR665 V3 and SR645 V3. It requires an Intel 4th Gen Xeon Scalable or AMD EPYC 9004 processor. It cannot be used in DDR4-based ThinkSystem V2 or V1 servers. When installing, populate memory channels symmetrically across all available memory channels per socket to ensure balanced memory interleaving and prevent performance degradation.
How to identify a genuine unit
Genuine Lenovo stock displays a label with option number 4X77A77496, field replaceable unit number SP47A77496, and feature code BNFD. The underlying DRAM board is manufactured by Samsung (M321R8GA0BB0-CQK), Micron, or SK hynix with Lenovo TruDDR5 authentication programmed into the SPD EEPROM. In the XClarity Controller web interface, the module will be recognized as TruDDR5 with verified vendor authenticity. Relabelled generic modules lack this cryptographic signature and show as generic memory.
Buying used
Request diagnostic test reports confirming zero uncorrectable memory errors and clean SPD readouts from Lenovo XCC. Inspect the surface-mounted PMIC chip and surrounding capacitors on the PCB center for physical impacts or signs of overheating. Ensure pins are pristine without corrosion. Pulled units from working decommissioned servers offer great savings compared to new boxed options, provided the seller offers a minimum 30-day testing warranty.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 490 (1 sighting, Oct 2026)
Used: USD 215 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| provantage.com | new | USD 490 | New in factory sealed Lenovo box | 2026-10-27 |
| ebay.com | used | USD 215 | Tested working pull with genuine TruDDR5 label, 100% health | 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 P43328-B21 HPE 64GB 2Rx4 DDR5-4800 SmartMemory RDIMM
FAQ
What is the rank architecture of the 4X77A77496 module?
It is a dual-rank x4 (2Rx4) registered memory module built with high-density 16Gb DDR5 DRAM chips.
Can 4X77A77496 be mixed with 32GB 1Rx4 DDR5 modules?
While supported by memory controller rules across different channels, mixing ranks and capacities within the same channel is not recommended for optimal performance.
Buying or selling 4X77A77496?
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 ThinkSystem SR650 V3 Server Product Guide - Memory Options, checked 2026-10-27