4X77A81435: lenovo ThinkSystem 32GB TruDDR5 5600MHz (1Rx4) RDIMM
Also listed as: 4X77A81435-01, 03GX088, SP47A81435, BV4C, M321R4GA3PB0-CWM
32GB single-rank DDR5-5600 registered ECC memory module designed for 5th Gen Intel Xeon Scalable and AMD EPYC 9004 processors in ThinkSystem V3 servers.
Specifications
| Part number | 4X77A81435 |
|---|---|
| Brand | lenovo |
| Type | Memory |
| Other numbers | 4X77A81435-01, 03GX088, SP47A81435, BV4C, M321R4GA3PB0-CWM |
| Type | DDR5 |
| Capacity (GB) | 32 |
| Speed mhz | 5,600 |
| Form factor | RDIMM |
| Rank | 1Rx4 |
| Voltage | 1.1 |
| Ecc | Yes |
About the 4X77A81435
The Lenovo 4X77A81435 is a high-speed 32GB single-rank DDR5-5600 registered ECC memory module. Designed for fifth-generation Intel Xeon Scalable Emerald Rapids and high-bin AMD EPYC 9004 processors, it delivers substantial memory bandwidth increases over previous 4800MHz modules while operating on an efficient 1.1V power architecture. It represents the performance sweet spot for modern mainstream dual-socket servers.
Compatibility
Compatible exclusively with Lenovo ThinkSystem V3 server architectures including SR650 V3, SR630 V3, SR665 V3, and SR645 V3. It requires an appropriate processor stepping and motherboard BIOS revision to operate at 5600 MT/s. It is mechanically and electrically keyed differently from DDR4 memory and cannot be installed into V1 or V2 server platforms.
How to identify a genuine unit
Carries an official Lenovo TruDDR5 label showing option code 4X77A81435, FRU part number 03GX088, and feature code BV4C. The module incorporates an integrated Power Management IC (PMIC) and sideband hub directly on the circuit board. In XClarity Controller, it validates as certified TruDDR5 memory, showing vendor serial numbers and sub-assembly details.
Buying used
When inspecting used DDR5 server memory, verify that the surface-mounted PMIC and onboard power inductors show no signs of physical impact or overheating. Check the 288-pin gold edge connector for even contact wear. Request diagnostic telemetry confirming that the module trains reliably at 5600 MT/s without reverting to 4800 MT/s fallback timings.
Reference prices (last 12 months, updated 2026-10-18)
New: USD 185 (1 sighting, Sep 2026)
Refurbished: USD 155 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| ServerMonkey | refurbished | USD 155 | Tested working pull | 2026-10-18 |
| Provantage | new | USD 185 | Factory sealed Lenovo option kit | 2026-09-25 |
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 4X77A81435?
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 - 4X77A81435, checked 2026-10-27
- Lenovo Technical Reference - 4X77A81435, checked 2026-10-27