The Lenovo ThinkSystem SR655 Rack Server is a powerful 2U, single-socket server designed to deliver high levels of performance, storage density, and I/O capability. Powered by AMD EPYC™ 7002 and 7003 Series processors, the SR655 combines high core counts, scalable DDR4 memory, PCIe Gen4 connectivity, flexible storage, and GPU acceleration within a versatile rack platform.

Its single-processor architecture delivers extensive compute capabilities while helping organizations optimize server utilization and infrastructure costs. The ThinkSystem SR655 is designed for workloads such as virtualization, big data, analytics, software-defined infrastructure, VDI, and other data-intensive enterprise applications.

Processor

The Lenovo ThinkSystem SR655 supports:

• One AMD EPYC™ 7002 Series processor.
• One AMD EPYC™ 7003 Series processor.
• Up to 64 processor cores.
• Processor speeds of up to 4.1 GHz, depending on the selected processor.
• Processor TDP of up to 280 W.

The server’s single-socket design provides a high level of processing density while maintaining a compact 2U rack form factor.

Memory

The ThinkSystem SR655 provides scalable DDR4 memory capabilities.

Memory Slots

• 16 DIMM slots.
• 8 memory channels.
• Up to 2 DIMMs per memory channel.

Memory Type

The server supports:

• Lenovo TruDDR4 RDIMM memory.

Memory Speed

Available memory speeds include:

• 3200 MHz
• 2933 MHz

With 3200 MHz memory installed, the server supports memory speeds of up to 3200 MHz at one DIMM per channel.

Maximum Memory Capacity

• Up to 2 TB using 16 x 128 GB 3DS RDIMMs.

Memory Protection

The ThinkSystem SR655 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 Lenovo ThinkSystem SR655 provides extensive storage flexibility through multiple front, mid-chassis, and rear drive configurations.

The server supports:

• Up to 20 x 3.5-inch drives.
• Up to 32 x 2.5-inch drives.

Depending on the selected server configuration, the SR655 supports:

• SAS drives
• SATA drives
• NVMe drives

Mid-Chassis Drive Bays

The server supports several optional mid-chassis storage configurations, including:

• 4 x 3.5-inch hot-swap SAS/SATA drive bays.
• 8 x 2.5-inch hot-swap SAS/SATA drive bays.
• 8 x 2.5-inch hot-swap NVMe drive bays.

These configurations provide additional flexibility for environments requiring increased storage density within the 2U chassis.

Storage Controllers

The Lenovo ThinkSystem SR655 supports multiple hardware RAID, HBA, and software storage controller configurations.

Available controller families include:

• ThinkSystem RAID adapters.
• SAS/SATA RAID controllers.
• Non-RAID Host Bus Adapters.
• NVMe connectivity options.

Supported RAID and HBA configurations vary according to the selected storage and drive configuration.

Internal Boot

The ThinkSystem SR655 supports optional M.2 storage for operating system boot and internal drive storage.

Available configurations include:

• Up to 2 x M.2 drives.
• RAID support depending on the selected M.2 adapter.

PCIe Expansion

The Lenovo ThinkSystem SR655 provides extensive PCIe Gen4 expansion capabilities.

The server supports:

• Up to 9 PCIe 4.0 slots.
• Up to 8 slots with rear access.
• 1 internal slot for a RAID adapter.
• Dedicated OCP adapter slot.

The exact PCIe slot configuration depends on the selected risers and internal storage configuration.

GPU Support

The ThinkSystem SR655 supports multiple GPU configurations for workloads that require additional acceleration.

Depending on the selected configuration, the server can support:

• Multiple single-width GPUs.
• Multiple double-width GPUs.
• GPU acceleration for AI inference.
• Virtual Desktop Infrastructure applications.
• High-performance visualization and compute workloads.

GPU support depends on the selected processor, storage, riser, cooling, and power supply configuration.

Network Connectivity

The Lenovo ThinkSystem SR655 includes a dedicated OCP 3.0 Small Form Factor slot with a PCIe 4.0 x16 host interface.

Supported network connectivity options include:

• 1 GbE
• 10 GbE
• 25 GbE

Both 2-port and 4-port network adapters are supported depending on the selected configuration.

Ports

Front Ports

The front panel includes:

• 2 x USB 3.1 Gen1 ports.
• Optional VGA port.

Rear Ports

The rear panel includes:

• USB 3.1 Gen1 ports.
• 1 x VGA port.
• 1 x DB-9 Serial port.
• 1 x RJ-45 1 GbE dedicated systems management port.

Power Supplies

The Lenovo ThinkSystem SR655 supports up to two hot-swap redundant power supplies.

Available AC power supply options include:

• 550 W
• 750 W
• 1100 W
• 1600 W

The supported AC power supplies feature 80 PLUS Platinum efficiency, with selected configurations also supporting Titanium efficiency.

A 1100 W -48 V DC power supply option is also available.

Cooling

The ThinkSystem SR655 uses hot-swappable variable-speed fans to provide system cooling.

The server supports:

• Five or six 60 mm hot-swap fans depending on the selected configuration.
• N+1 fan redundancy.

With N+1 redundancy, the server can continue operating normally if one system fan fails.

Additional fans are integrated into the server power supplies.

Systems Management

The Lenovo ThinkSystem SR655 includes integrated management technologies designed to simplify server configuration, monitoring, firmware management, and maintenance.

Supported management technologies include:

• ASPEED AST2500 Baseboard Management Controller.
• Lenovo XClarity Provisioning Manager Lite.
• Lenovo XClarity Administrator.
• Lenovo XClarity Energy Manager.

XClarity Provisioning Manager Lite

Lenovo XClarity Provisioning Manager Lite provides tools for:

• Initial server setup.
• Firmware updates.
• System diagnostics.
• Operating system deployment and configuration.

Management Protocols

The server also supports industry-standard management technologies and protocols, including:

• IPMI 2.0
• SNMP 3.0
• Redfish REST API
• Serial console through IPMI

Security

The Lenovo ThinkSystem SR655 provides several integrated security features designed to protect server hardware, firmware, and access.

Security capabilities include:

• Power-on password.
• Administrator password.
• Trusted Platform Module.
• TPM 2.0 support.
• Optional lockable front security bezel.
• Optional chassis intrusion switch.

These capabilities help provide additional protection throughout the server lifecycle.

Hot-Swap Components

The ThinkSystem SR655 supports hot-swap components to help improve server availability and simplify maintenance.

Hot-swappable components include:

• Storage drives.
• Power supplies.
• System fans.

Form Factor

The Lenovo ThinkSystem SR655 is designed as a:

• 2U Rack Server
• Single-Socket Platform

Its 2U chassis provides extensive storage, GPU, networking, and PCIe expansion capabilities while using only one processor socket.

Dimensions and Weight

The Lenovo ThinkSystem SR655 dimensions are:

• Height: 87 mm (3.4 inches)
• Width: 445 mm (17.5 inches)
• Depth: 764 mm (30.1 inches)
• Maximum Weight: 35.4 kg (78.0 lbs.)

Operating Systems

The Lenovo ThinkSystem SR655 supports several operating systems and virtualization platforms, including:

• Microsoft Windows Server
• Microsoft Windows 10
• Microsoft Windows 11
• Red Hat Enterprise Linux
• SUSE Linux Enterprise Server
• VMware ESXi

Supported operating system versions and available server configurations depend on the selected AMD EPYC processor generation and installed hardware.

Warranty

The Lenovo ThinkSystem SR655 is available with:

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

Optional service and warranty upgrades are also available.