The Lenovo ThinkSystem SR645 Rack Server is a compact 1U, two-socket server designed to deliver high compute density, strong memory performance, flexible storage, and enterprise-class management capabilities.

Powered by AMD EPYC™ 7002 and 7003 Series processors, the ThinkSystem SR645 provides a high core count within a space-efficient rack design. Its combination of processing power, memory capacity, PCIe Gen4 connectivity, and NVMe storage makes it suitable for demanding enterprise data center workloads.

The server is designed to support environments such as databases, analytics, virtualization, and high-performance computing where increased processor utilization, memory bandwidth, and I/O performance are essential.

Processor

The Lenovo ThinkSystem SR645 supports:

• Up to two AMD EPYC™ 7002 Series processors.
• Up to two AMD EPYC™ 7003 Series processors.
• Up to 64 cores per processor.
• Processor TDP of up to 280 W.

Its dual-socket architecture provides extensive processing capabilities within a compact 1U form factor.

Memory

The ThinkSystem SR645 provides scalable DDR4 memory capabilities.

Memory Slots

• 32 DDR4 DIMM slots.

Memory Type

The server supports:

• Lenovo TruDDR4 RDIMMs.
• 3DS RDIMMs.

Memory Speed

• Up to 3200 MHz.

Maximum Memory Capacity

• Up to 8 TB using 32 x 256 GB 3DS RDIMMs.

The server’s high memory capacity supports workloads that require large amounts of system memory within a dense rack environment.

Memory Protection

The Lenovo ThinkSystem SR645 provides several memory protection capabilities, including:

• ECC
• SDDC
• Patrol Scrubbing
• Demand Scrubbing
• DRAM Address Command Parity with Replay
• DRAM Uncorrected ECC Error Retry
• Post Package Repair

Drive Bays and Storage

The ThinkSystem SR645 provides several storage configurations.

Available drive options include:

• Up to 4 x 3.5-inch drives.
• Up to 12 x 2.5-inch drives.
• Up to 12 x NVMe drives with direct 1:1 connections.

The server supports SAS, SATA, and NVMe storage depending on the selected configuration.

Storage Controllers

The Lenovo ThinkSystem SR645 supports multiple RAID and HBA configurations depending on the selected storage setup.

Available storage controller options include:

• ThinkSystem RAID adapters.
• SAS/SATA RAID controllers.
• Non-RAID Host Bus Adapters.
• NVMe storage configurations.

The exact controller configuration depends on the selected drives and server configuration.

PCIe Expansion

The ThinkSystem SR645 provides PCIe Gen4 expansion capabilities.

The server supports:

• Up to 3 x PCIe 4.0 expansion slots.
• 1 x OCP 3.0 adapter slot.

PCIe Gen4 connectivity provides increased bandwidth for networking, storage, and accelerator configurations.

GPU Support

The Lenovo ThinkSystem SR645 supports:

• Up to 3 single-width 75 W GPUs.

GPU support allows the server to provide additional acceleration for selected enterprise and high-performance workloads.

Network Connectivity

The ThinkSystem SR645 provides flexible networking options through:

• OCP 3.0 mezzanine adapters.
• PCIe network adapters.

The available network configuration can be selected according to the performance and connectivity requirements of the server environment.

Power Supplies

The Lenovo ThinkSystem SR645 supports:

• Dual redundant power supplies.
• Power supply configurations of up to 1800 W Platinum.

Redundant power supply support helps maintain system availability in enterprise data center environments.

Ports

Front Ports

The front panel includes:

• 1 x USB 3.1 Gen1 port.
• 1 x USB 2.0 port.
• 1 x optional VGA port.

Rear Ports

The rear panel includes:

• 3 x USB 3.1 Gen1 ports.
• 1 x optional Serial port.
• 1 x RJ-45 dedicated management port.

Systems Management

The Lenovo ThinkSystem SR645 includes:

• Lenovo XClarity Controller.

Lenovo XClarity provides centralized system management capabilities for configuration, monitoring, maintenance, and server lifecycle management.

Security

The ThinkSystem SR645 incorporates Lenovo ThinkShield security technologies designed to provide protection throughout the server lifecycle.

AMD EPYC processors also provide integrated security capabilities, including:

• Secure Boot.
• Memory encryption capabilities.

These technologies contribute to protecting server infrastructure, firmware, and system data.

Form Factor

The Lenovo ThinkSystem SR645 is designed as a:

• 1U Rack Server
• Dual-Socket Platform

Its compact 1U architecture provides high processor and memory density while minimizing rack space requirements.

Operating Systems

The Lenovo ThinkSystem SR645 supports several operating systems and virtualization platforms, including:

• Microsoft Windows Server
• SUSE Linux Enterprise Server
• Red Hat Enterprise Linux
• VMware ESXi

Warranty

The Lenovo ThinkSystem SR645 is available with:

• 1-year or 3-year limited warranty options.
• Customer Replaceable Unit service.
• On-site service.
• Next-business-day 9 x 5 support.

Optional service upgrades are also available.