Server : ThinkSystem SR655

Introduction

The Lenovo ThinkSystem SR655 is a 1-socket 2U server that features the new AMD EPYC 7002 "Rome" family of processors. With up to 64 cores per processor and support for the new PCIe 4.0 standard for I/O, the SR655 offers the ultimate in single-socket server performance. With up to 128 PCIe lanes, the server is ideal for workloads that can take advantage of GPU processing and high-performance NVMe drives.

Suggested uses: AI Inference, VDI, OLTP, Analytics, software-defined storage

Key features

Combining performance and flexibility, the SR655 server is a great choice for enterprises of all sizes. The server offers a broad selection of drive and slot configurations and offers high performance features that industries such as finance, healthcare and telco need. Outstanding reliability, availability, and serviceability (RAS) and high-efficiency design can improve your business environment and can help save operational costs.

Scalability and performance

The SR655 offers numerous features to boost performance, improve scalability and reduce costs

Supports the new AMD EPYC 7002 family of processors

Supports processors with up to 64 cores and 128 threads, core speeds of up to 3.7 GHz, and TDP ratings of up to 280W.

Support for up to 16 TruDDR4 memory DIMMs, with 8 memory channels and 2 DIMMs per channel. With 1 DIMM installed per channel (8 DIMMs total), memory operates at up to 3200 MHz. With 2 DIMMs per channel (16 DIMMs total), memory operating at up to 2933 MHz.

Using 128GB 3DS DIMMs, the server supports up to 2TB of system memory.

Supports 3 double-width GPUs up to 300W each, or 6 single-width GPUs up to 75W each. A 6:1 ratio of GPUs to CPUs means substantial processing power is available with just one CPU.

Supports up to 32x 2.5-inch hot-swap drive bays, by using combinations of front-accessible (up to 24 bays), mid-accessible (up to 8), and rear-accessible (up to 4) drive bays.

Supports 3.5-inch drive bays for lower-cost high-capacity storage. 2.5-inch and 3.5-inch drive bays can be mixed in several combinations.

Supports 16x SATA drives using the onboard SATA controller (no additional adapter needed), enabling lower cost, high capacity storage solution for cold storage workloads.

Supports up to 28x NVMe drives without oversubscription of PCIe lanes (1:1 connectivity), or up to 32x NVMe drives with a 2:1 oversubscription. The use of NVMe drives maximizes drive I/O performance, in terms of throughput, bandwidth, and latency.

Supports high-speed RAID controllers from Broadcom providing 12 Gb SAS connectivity to the drive backplanes. A variety of RAID adapters are available, with cache and support for up to 24 drives on a single controller.

Supports M.2 drives for convenient operating system boot functions or data storage. Available M.2 adapters support either one M.2 drive or two M.2 drives in a RAID 1 configuration for performance and reliability.

The server has a dedicated industry-standard OCP 3.0 small form factor (SFF) slot, with a PCIe 4.0 x16 interface, supporting a variety of Ethernet network adapters. Simple-swap mechanism with thumbscrews and pull-tab enables tool-less installation and removal of the adapter. Supports shared BMC network sideband connectivity to enable out-of-band systems management.

The server offers PCI Express 4.0 I/O expansion capabilities that doubles the theoretical maximum bandwidth of PCIe 3.0 (16GT/s in each direction for PCIe 4.0, compared to 8 GT/s with PCIe 3.0). A PCIe 4.0 x16 slot provides 64 GB/s bandwidth, enough to support a 400GbE network connection.

A total of up to 9 PCIe 4.0 slots (8 with rear access, 1 internal for a RAID adapter) plus a slot dedicated to the OCP adapter

Standard specifications

The following table lists the standard specifications

Machine types : 7Y00 - 1 year warranty  /  7Z01 - 3 year warranty

Form factor  :  2U rack

Processor  :  One AMD EPYC 7002 Series processor (formerly codenamed "Rome")

Supports processors up to 64 cores, core speeds of up to 3.7 GHz, and TDP ratings of up to 280W

Memory : 16 DIMM slots. The processor has 8 memory channels, with 2 DIMMs per channel. Lenovo TruDDR4 RDIMMs are supported. DIMMs are available in two speeds: 3200 MHz and 2933 MHz. With 3200 MHz memory, the server supports a 3200 MHz memory bus speed at 1 DIMM per channel (DPC) and 2933 MHz at 2 DPC. With 2933 MHz memory, the server supports a 2933 MHz memory bus speed at both 1 and 2 DPC

Memory maximum   :  Up to 2TB with 16x 128GB 3DS RDIMMs

Persistent memory  : Not supported

Memory protection  : ECC, SDDC, Patrol/Demand Scrubbing, DRAM Address Command Parity with Replay, DRAM Uncorrected ECC Error Retry, Post Package Repair

Disk drive bays

Up to 20x 3.5-inch or 32x 2.5-inch hot-swap drive bays

• Front: up to 12x 3.5-inch or 24x 2.5-inch, hot-swap bays
• Mid (internal): up to 4x 3.5-inch or 8x 2.5-inch, hot-swap bays
• Rear: up to 4x 3.5-inch or 4x 2.5-inch hot-swap bays

With 2.5-inch drive bays, mid (internal) bays and rear drives are mutually exclusive. See Supported drive bay combinations for details. Mid bays are hot-swap drive bays and are accessible by removing the top cover of the server. 4x 3.5-inch front drive bays can be configured as AnyBay supporting SAS, SATA or NVMe. 2.5-inch drive bays can be configured as NVMe, supporting 28x NVMe drives with direct connections (no oversubscription), or 32x NVMe drives with 2:1 oversubscription

Maximum internal storage

• All NVMe: 184.32 TB using 24x 6.4 TB NVMe (front) + 8x 3.84TB NVMe SSDs (mid)
• All SSDs: 245.76 TB using 32x 7.68TB SSDs (24x front, 8x mid)
• All HDDs: 280 TB using 20x 14TB 3.5-inch HDDs (12x front, 4x mid, 4x rear)
• Mix of SSDs/HDDs supported but not in the same array

Storage controller

• Onboard SATA supporting up to 16 SATA drives (no RAID)
• 12 Gb SAS/SATA RAID adapters:
  • RAID 530i (cacheless) supports RAID 0, 1, 10, 5, 50
  • RAID 730-8i with 1GB cache supports RAID 0, 1, 10, 5, 50
  • RAID 730-8i with 2GB flash-backed cache supports RAID 0, 1, 10, 5, 50, 6, 60
  • RAID 930-8i with 2GB flash-backed cache supports RAID 0, 1, 10, 5, 50, 6, 60
  • RAID 930-16i and 24i with 4GB or 8GB flash-backed cache supports RAID 0, 1, 10, 5, 50, 6, 60
• 12 Gb SAS/SATA non-RAID: 430-8i and 430-16i HBAs

Optical drive bays  :  No internal optical drive

Tape drive bays  :  No internal backup drive

Network interfaces  :   Dedicated OCP 3.0 SFF slot with PCIe 4.0 x16 host interface. Supports a variety of 2-port and 4-port adapters with 1GbE, 10GbE and 25GbE network connectivity. One port can optionally be shared with the ASPEED management processor for Wake-on-LAN and NC-SI support

PCI Expansion slots

A total of up to 9 PCIe 4.0 slots (8 with rear access, 1 internal for a RAID adapter) plus a slot dedicated to the OCP adapter. Slot availability is based on riser selection

Slot length is dependent on the use of a mid-chassis drive cage: If the mid drive cage is present then slots are half-length; if the mid drive cage is not present, then slots are full-length.

• Riser 1: Slots 1, 2 and 3 - all FHHL or FHFL (16 or 32 lanes)
  • Option 1*: 1=x16, 2=x8, 3=x8
  • Option 2*: 1=x16, 2=x16 (no slot 3)
  • Option 3: 3=x16 (no slot 1 or slot 2)
  • Option 4: 1=x16 (no slot 2 or slot 3)
• Riser 2: Slots 4, 5, and 6 - slot size varies (32 lanes)
  • Option 1: 4=x16, 5=x8, 6=x8
  • Option 2: 4=x16, 5=x16 (no slot 6)
  • Option 3: 6=x16 (no slot 4 or slot 5)
• Riser 3: Slots 7 and 8 - both FHHL or FHFL (16 or 32 lanes)
  • Option 1*: 7=x8, 8=x8
  • Option 2*: 7=x16, 8=x16
• Slot 9: Internal PCIe 4.0 x8 low-profile slot for internal drive controller

* The use of 32 lanes with Riser 1 or the use of Riser 3 imposes restrictions on the use of the onboard SATA controller or the use of the M.2 Module or both. See the I/O expansion section for details.Ports

Front: Two USB 3.1 G1 (5 Gb/s) ports, optional VGA port

Rear: USB 3.1 G1 (5 Gb/s) ports, one VGA video port, one DB-9 serial port, and one RJ-45 1GbE systems management port

Internal: Optional M.2 module supporting up to two M.2 drives (for OS boot and drive storage support; not available in all configurations)

Cooling Five or six N+1 redundant hot swap 60 mm fans,  configuration dependent. One fan integrated in each power supply

Power supply  :  Up to two hot-swap redundant AC power supplies (all 80 PLUS Platinum certification): 550 W, 750 W, 1100 W and 1600 W AC options, supporting 220 V AC. 550 W, 750 W and 1100 W options also support 110V input supply. In China only, all power supply options support 240 V DC

Video : Onboard graphics with 512 MB memory with 2D hardware accelerator, integrated into the ASPEED AST2500 BMC management processor. Maximum resolution is 1920x1200 at 60Hz, 32bpp

Hot-swap parts  :  Drives, power supplies, and fans

Systems management  :  ASPEED AST2500 embedded management processor, XClarity Provisioning Manager Lite (LXPM Lite) for system setup and firmware upgrades. XClarity Administrator centralized infrastructure management, and XClarity Energy Manager centralized server power management. Light path diagnostics for local failure detection and reporting

Security features  : Power-on password, administrator's password, Trusted Platform Module (TPM), supporting TPM 2.0. In China only, optional Nationz TPM 2.0. Optional lockable front security bezel. Optional chassis intrusion switch

Operating systems supported  :  Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware ESXi. See the Operating system support section for specifics

Limited warranty  : Three-year or one-year (model dependent) customer-replaceable unit and onsite limited warranty with 9x5 next business day (NBD)

Service and support  : Optional service upgrades are available through Lenovo Services: 4-hour or 2-hour response time, 6-hour fix time, 1-year or 2-year warranty extension, software support for Lenovo hardware and some third-party applications

Dimensions  : Height: 86 mm (3.4 in.), width: 445 mm (17.5 in.), depth: 765 mm (30.1 in.)

Weight  : Maximum: 35.4 kg (78.0 lb)

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