Lenovo 64GB DDR4-2666 ECC Load Reduced DIMM — 4ZC7A08718

The Lenovo 4ZC7A08718 is a 64GB DDR4-2666 (PC4-21300) ECC Load Reduced DIMM (LRDIMM) operating at 1.2V with CL19 latency in a quad rank configuration. An alternate part number variant of the 7X77A01305, 01DE975, and 01KR369, it delivers the same high-density DDR4-2666 LRDIMM storage for Lenovo ThinkSystem servers requiring maximum per-slot memory capacity.

Key Features

• 64GB — high-capacity DDR4-2666 LRDIMM per slot
• DDR4-2666 (PC4-21300) — broad ThinkSystem server compatibility
• ECC Load Reduced (LRDIMM) — error correction with memory buffer for high density
• Quad Rank — maximum capacity per DIMM slot
• 1.2V operating voltage
• CL19 latency
• 288-pin DIMM — standard server memory interface
• Validated for Lenovo ThinkSystem servers

Product Specifications

• Part Number: 4ZC7A08718
• Manufacturer: Lenovo
• OEM Status: OEM Lenovo ThinkSystem
• Capacity: 64GB
• Speed: DDR4-2666 (PC4-21300)
• Type: ECC Load Reduced DIMM (LRDIMM)
• Form Factor: 288-Pin DIMM
• Voltage: 1.2V
• CAS Latency: CL19
• Rank: Quad Rank

Memory Specifications

• Capacity: 64GB
• DDR Generation: DDR4
• Speed: 2666MHz (PC4-21300)
• CAS Latency: CL19
• Voltage: 1.2V
• ECC: Yes
• Buffered: Load-Reduced (LRDIMM)
• Rank: Quad Rank
• Form Factor: 288-Pin DIMM

Performance Specifications

• Bandwidth: Up to 21,300 MB/s (PC4-21300)
• Operating Temperature: 0°C to 85°C

Use Cases

• High-density memory configurations in Lenovo ThinkSystem DDR4-2666 servers
• In-memory databases requiring large per-server memory capacity
• High-density virtualization with maximum VM memory per server
• Large-scale analytics requiring maximum DDR4-2666 capacity

Compatibility

• Lenovo ThinkSystem servers supporting DDR4-2666 64GB LRDIMM (Quad Rank)
• Verify platform LRDIMM support from Lenovo's ThinkSystem memory configuration guide
• Not compatible with consumer desktop or laptop platforms

Frequently Asked Questions

What is the difference between 4ZC7A08718, 7X77A01305, 01DE975, and 01KR369?

All four are Lenovo 64GB DDR4-2666 ECC Load Reduced CL19 Quad Rank LRDIMMs — alternate part numbers that may differ in DRAM manufacturer or specific server model validation. Verify from Lenovo's compatibility matrix.

What is an LRDIMM vs RDIMM?

An LRDIMM uses a memory buffer chip to reduce electrical load on the memory controller, enabling higher DIMM counts and capacities per channel than standard RDIMMs. LRDIMMs are required for very high per-slot capacities like 64GB and 128GB.

Is this compatible with non-Lenovo servers?

This is an OEM Lenovo ThinkSystem LRDIMM validated for ThinkSystem servers. Compatibility with non-Lenovo servers is not guaranteed.

The Lenovo 4ZC7A08718 delivers 64GB of DDR4-2666 ECC Load Reduced server memory in a quad rank LRDIMM configuration — validated for Lenovo ThinkSystem servers requiring high-density DDR4-2666 memory for enterprise workloads.