4X77A08631: lenovo ThinkSystem 16GB TruDDR4 2933MHz (1Rx4 1.2V) RDIMM
Also listed as: 4X77A08631-01, 01KR353, SP47A08631, B4AE, M393A2K40CB2-CVF
16GB single-rank DDR4-2933 registered ECC memory module for Lenovo ThinkSystem V1 and V2 servers powered by 2nd Gen Intel Xeon Scalable processors.
Specifications
| Part number | 4X77A08631 |
|---|---|
| Brand | lenovo |
| Type | Memory |
| Other numbers | 4X77A08631-01, 01KR353, SP47A08631, B4AE, M393A2K40CB2-CVF |
| Type | DDR4 |
| Capacity (GB) | 16 |
| Speed mhz | 2,933 |
| Form factor | RDIMM |
| Rank | 1Rx4 |
| Voltage | 1.2 |
| Ecc | Yes |
About the 4X77A08631
The Lenovo 4X77A08631 is an authentic 16GB single-rank DDR4-2933 registered ECC memory module engineered for first and second generation ThinkSystem servers. Positioned as an entry density RDIMM for balanced memory channel populations, it operates at a standard 1.2V power profile. It was widely deployed during the Intel Xeon Scalable Cascade Lake generation before being succeeded by 3200MHz DDR4 options.
Compatibility
Compatible with Lenovo ThinkSystem SR650, SR630, SR850, SR950, and SD530 dense compute nodes equipped with 2nd Generation Intel Xeon Scalable processors. When installed alongside Cascade Lake CPUs, it operates at full 2933 MT/s bus speeds. It is physically incompatible with DDR5-based ThinkSystem V3 systems and cannot be mixed with unbuffered ECC or load-reduced DIMMs within the same channel.
How to identify a genuine unit
Genuine Lenovo modules bear a white inventory label listing part number 4X77A08631, FRU 01KR353, and feature code B4AE alongside the Lenovo TruDDR4 corporate branding. The underlying memory ICs typically originate from Samsung with raw card identifier M393A2K40CB2-CVF. In the XClarity Controller inventory, the DIMM identifies with vendor signature Lenovo and full SPD telemetry.
Buying used
When sourcing pre-owned 16GB modules, examine the 288-pin gold connector contacts for gouges or oxidation. Request diagnostic logs showing error-free operation through full memtest cycles with zero uncorrectable ECC events. Ensure all modules in a target server channel share matching rank structures to maintain balanced memory subsystem throughput.
Reference prices (last 12 months, updated 2026-10-05)
Refurbished: USD 45 (1 sighting, Sep 2026)
Used: USD 38 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| eBay | used | USD 38 | eBay sold listing, tested clean | 2026-10-05 |
| ServerMonkey | refurbished | USD 45 | OEM pulled single module | 2026-09-12 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Fits these models
- Lenovo ThinkSystem SR650
- Lenovo ThinkSystem SR630
- Lenovo ThinkSystem SR850
- Lenovo ThinkSystem SR950
- Lenovo ThinkSystem SD530
Buying or selling 4X77A08631?
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 - 4X77A08631, checked 2026-10-27
- Lenovo Technical Reference - 4X77A08631, checked 2026-10-27