Lenovo 128GB 3200MHz DDR4 PC4-25600 CL22 288-Pin ECC Registered DIMM 1.2V Quad Rank x4 Memory Module – 4X77A08636

Lenovo 128GB DDR4-3200 ECC Registered DIMM — 4X77A08636

The Lenovo 4X77A08636 is a 128GB DDR4-3200 (PC4-25600) ECC Registered DIMM operating at 1.2V with CL22 latency in a quad rank x4 configuration. Designed for Lenovo ThinkSystem servers, it delivers maximum per-slot memory capacity for memory-intensive enterprise workloads such as large-scale virtualization, in-memory databases, and high-performance analytics.

Key Features

• 128GB DDR4-3200 (PC4-25600) — maximum capacity server RDIMM
• ECC Registered (RDIMM) — error correction and signal buffering
• Quad Rank x4 — highest capacity per DIMM slot
• 1.2V operating voltage
• CL22 latency
• 288-pin DIMM — standard server memory interface
• Validated for Lenovo ThinkSystem servers

Product Specifications

• Part Number: 4X77A08636
• Manufacturer: Lenovo
• OEM Status: OEM Lenovo ThinkSystem
• Capacity: 128GB
• Speed: DDR4-3200 (PC4-25600)
• Type: ECC Registered DIMM (RDIMM)
• Form Factor: 288-Pin DIMM
• Voltage: 1.2V
• CAS Latency: CL22
• Rank: Quad Rank x4

Memory Specifications

• Capacity: 128GB
• DDR Generation: DDR4
• Speed: 3200MHz (PC4-25600)
• CAS Latency: CL22
• Voltage: 1.2V
• ECC: Yes
• Buffered: Registered (RDIMM)
• Rank: Quad Rank x4
• Form Factor: 288-Pin DIMM

Performance Specifications

• Bandwidth: Up to 25,600 MB/s (PC4-25600)
• Operating Temperature: 0°C to 85°C

Use Cases

• Large-scale virtualization requiring maximum memory per server
• In-memory databases (SAP HANA, Oracle, Redis)
• High-performance analytics and data warehousing
• AI/ML inference servers requiring large memory footprint

Compatibility

• Lenovo ThinkSystem servers supporting DDR4-3200 Quad Rank RDIMM
• Note: Quad Rank DIMMs may operate at reduced speed on some platforms — verify from Lenovo”s compatibility matrix
• Not compatible with consumer desktop or laptop platforms

Frequently Asked Questions

What is the difference between 4X77A08636 and 02JK973?

Both are Lenovo 128GB DDR4-3200 ECC Registered Quad Rank x4 DIMMs — alternate part numbers that may differ in DRAM manufacturer or specific server model validation. Verify from Lenovo”s compatibility matrix.

What is a Quad Rank DIMM?

Quad Rank DIMMs have four independent sets of DRAM chips, enabling the highest capacity per DIMM slot. Some memory controllers may limit the number of Quad Rank DIMMs per channel — verify your server”s memory population rules.

Will this run at full 3200MHz speed?

Speed depends on the server platform and memory population. Some servers may downclock Quad Rank DIMMs when multiple slots are populated. Verify from Lenovo”s ThinkSystem memory configuration guide.

The Lenovo 4X77A08636 delivers 128GB of DDR4-3200 ECC Registered server memory in a quad rank x4 configuration — the maximum capacity RDIMM for Lenovo ThinkSystem servers requiring the highest per-slot memory density for enterprise workloads.