4X77A90966 - Lenovo 4X77A90966 64GB TruDDR5 6400MHz RDIMM

Name: Lenovo 4X77A90966 64GB TruDDR5 6400MHz RDIMM
Brand: Lenovo
SKU: 4X77A90966
Price: 4620 USD
Availability: InStock

4X77A90966 - Lenovo 4X77A90966 64GB TruDDR5 6400MHz RDIMM | US IT Hardware

Product overview

The Lenovo 4X77A90966 is a 64GB enterprise-class DDR5 registered DIMM (RDIMM) module designed for high-performance ThinkSystem server platforms including the SR630 V4 and SC750 V4. Operating at 6400MHz with dual-rank (2Rx4) configuration, this module delivers enhanced memory bandwidth and throughput for demanding datacenter workloads. The module features full ECC (Error-Correcting Code) protection, registered architecture for improved signal integrity in multi-DIMM configurations, and operates at 1.1V for optimal power efficiency. With 16Gb DRAM technology, it supports up to 8TB total system memory when populated with 32x 256GB 3DS RDIMMs in dual-processor configurations. Ideal for virtualization, database acceleration, analytics, and high-performance computing environments requiring reliable, high-capacity memory with enterprise-grade error protection and thermal management.

64GB capacity with 6400MHz speed for high-throughput memory operations.
Dual-rank (2Rx4) registered DIMM architecture for signal integrity.
Full ECC protection prevents silent data corruption in production.
1.1V operating voltage optimizes power efficiency and thermal performance.
288-pin DIMM form factor compatible with ThinkSystem platforms.
16Gb DRAM technology supports up to 8TB per dual-processor system.

Expedited and overnight shipping options are available at checkout, priced by destination and service.
Purchase orders accepted from qualified institutions.
Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Featuring

Sub-Category
Manufacturer part #	4X77A90966
Brand	Lenovo
Condition	New
Capacity	64GB
Category	Memory
Data Width	64-bit (x4 DRAM)
Model Name	ThinkSystem 64GB TruDDR5 6400MHz (2Rx4) RDIMM
Memory Type	DDR5 Registered DIMM (RDIMM)
Feature Code	C0TQ
Product Line	ThinkSystem
Product Type	Server Memory Module (Registered DIMM)

Compatible systems

The 4X77A90966 is fully compatible with Lenovo ThinkSystem SR630 V4 and SC750 V4 servers equipped with Intel Xeon 6500P or 6700P-series processors. No firmware updates, additional hardware, or configuration changes are required for installation. Module operates at rated 6400MHz when populated at 1 DPC or downclocks to 5200MHz at 2 DPC. All enterprise memory protection features (ECC, SDDC, ADDDC, mirroring) are natively supported.

Lenovo ThinkSystem
Model: SR630 V4
Form factor: 1U Rack Server
Generation: V4
Supports up to 32 DDR5 DIMMs (16 per processor); operates at 6400MHz (1 DPC) or 5200MHz (2 DPC); compatible with Xeon 6500P and 6700P-series processors.
Lenovo ThinkSystem
Model: SC750 V4
Form factor: 2U Rack Server
Generation: V4
Supports DDR5 memory with same frequency and protection features as SR630 V4; verified compatible per ServerProven documentation.

Best for

Data Center Infrastructure
Primary memory upgrade for Lenovo ThinkSystem SR630 V4 and SC750 V4 servers in large-scale datacenter deployments requiring high-capacity, high-speed memory for consolidated workloads.
Virtualization Platforms
Supports dense virtual machine hosting with improved memory bandwidth; enables higher VM density and faster guest OS performance in hypervisor environments.

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Lenovo Enterprise Drives

Speed at 1 DPC	6400MHz (rated speed)

Speed at 2 DPC	5200MHz (automatic downclocking)

DRAM Technology	16Gb per chip

Operating Speed	6400MHz (PC5-51200)

RoHS Compliance	Yes - Lenovo TruDDR5 modules comply with RoHS standards

Error Correction	ECC (Error-Correcting Code)

Part Number (SKU)	4X77A90966

Compatible Systems	ThinkSystem SR630 V4, SC750 V4

Rank Configuration	Dual-rank (2Rx4)

Compatible Processors	Intel Xeon 6500P, 6700P-series (3rd-gen Scalable)

Registered Architecture	Yes - Registered DIMM (RDIMM) with register chip

Memory Protection Features	ECC, SDDC, ADDDC, Memory Mirroring

Maximum DIMMs per Processor	16 DIMMs (32 total in dual-processor configuration)

Memory Channels per Processor	8 channels (2 DIMMs per channel maximum)

Maximum Memory Capacity (Dual Processor)	8TB (using 32x 256GB 3DS RDIMMs)

Maximum Memory Capacity (with 4X77A90966)	2TB (32x 64GB modules at 6400MHz)

Operating Voltage	1.1V
Power Consumption	Reduced vs. DDR4 due to 1.1V operation

Form Factor	288-pin DIMM

Environmental

Humidity Range	5% to 95% non-condensing
Thermal Sensors	Integrated thermal monitoring
Cooling Requirement	Passive cooling via standard server airflow
Storage Temperature Range	-40°C to 100°C
Operating Temperature Range	0°C to 85°C (typical server environment)

Warranty	Standard Lenovo hardware warranty (typically 3 years)
Availability	In production; actively supported

Frequently asked questions

What is the maximum memory capacity supported by a ThinkSystem SR630 V4 using 4X77A90966 modules?

The SR630 V4 supports up to 32 DDR5 DIMM slots (16 per processor in dual-processor configuration) with 8 memory channels per processor. Using 32x 256GB 3DS RDIMMs, the system achieves 8TB maximum memory. With 4X77A90966 64GB modules, you can populate up to 32 DIMMs for 2TB total capacity at 6400MHz (1 DPC) or 5200MHz (2 DPC).

Does the 4X77A90966 support memory mirroring and SDDC protection?

Yes. The ThinkSystem SR630 V4 supports multiple memory protection mechanisms including ECC, SDDC (Single Device Data Correction) for x4-based memory DIMMs, ADDDC (Advanced Double Device Data Correction) for x4-based DIMMs, and memory mirroring. The 4X77A90966 (2Rx4 configuration) qualifies for SDDC and ADDDC protection, providing enterprise-grade reliability.

What is the operating frequency when populating 2 DIMMs per channel in SR630 V4?

When operating at 2 DIMMs per channel (2 DPC), the ThinkSystem SR630 V4 supports DDR5 memory at 5200MHz. The 4X77A90966 is rated for 6400MHz at 1 DPC; at 2 DPC, frequency automatically downclocks to 5200MHz to maintain signal integrity across the memory bus.

Is the 4X77A90966 compatible with ThinkSystem SC750 V4 servers?

Yes. The 4X77A90966 is explicitly listed as compatible with both ThinkSystem SR630 V4 and SC750 V4 server platforms. Both systems support the same DDR5 memory architecture, 6400MHz operation at 1 DPC, and registered DIMM (RDIMM) technology with identical ECC and SDDC protection features.

What is the voltage specification and thermal design of this module?

The 4X77A90966 operates at 1.1V, which is the standard DDR5 registered DIMM voltage. This lower voltage compared to DDR4 (1.2V) reduces power consumption and heat generation. The module integrates thermal sensors and is designed for passive cooling in enterprise server chassis with standard airflow management.

Can I mix 4X77A90966 (64GB) with other capacity modules in the same server?

Lenovo recommends using identical memory modules within a server for optimal performance and reliability. While some mixing may be technically possible, it can result in reduced operating frequency, disabled advanced features, or unpredictable behavior. For production deployments, populate all DIMM slots with matching capacity and speed modules.

What DRAM technology does the 4X77A90966 use and why does it matter?

The 4X77A90966 uses 16Gb DRAM technology (16 gigabits per chip), which is the standard for DDR5 RDIMMs. This density allows 64GB capacity in a single DIMM while maintaining compatibility with server memory controllers. Higher density (16Gb vs. older 8Gb) enables larger per-DIMM capacities and supports the 8TB maximum memory configurations in modern ThinkSystem platforms.

Lenovo 4X77A90966 64GB TruDDR5 6400MHz RDIMM

Product overview

Featuring

Compatible systems

Best for

Details

Shipping, warranty & returns

Customer reviews

Power Consumption

Physical Characteristics

Environmental

Warranty & Support

Frequently asked questions

Lenovo 4X77A90966 64GB TruDDR5 6400MHz RDIMM

Product overview

Featuring

Compatible systems

Best for

Details

Shipping, warranty & returns

Customer reviews

Shop these collections

Power Consumption

Physical Characteristics

Environmental

Warranty & Support

Frequently asked questions