The Lenovo ThinkSystem SR645 is a 2-socket 1U server that features the AMD EPYC 7002 “Rome” and AMD EPYC 7003 “Milan” families of processors. With up to 64 cores per processor and support for the new PCIe 4.0 standard for I/O, the SR645 offers the ultimate in two-socket server performance in a space-saving 1U form factor. The server is ideal for dense workloads that can take advantage of GPU processing and high-performance NVMe drives.

Suggested uses: HPC, database, virtualization, and VDI

Machine types7D2Y – 1 year warranty
7D2X – 3 year warranty
Form factor1U rack.
ProcessorOne or two AMD EPYC 7002 Series processors (formerly codenamed “Rome”) or AMD EPYC 7003 Series processors (formerly codenamed “Milan”). Supports processors up to 64 cores, core speeds of up to 4.1 GHz, and TDP ratings of up to 280W.
ChipsetNot applicable (platform controller hub functions are integrated into the processor)
Memory32 DIMM slots with two processors (16 DIMM slots per processor). Each processor has 8 memory channels, with 2 DIMMs per channel (DPC). Lenovo TruDDR4 RDIMMs and 3DS RDIMMs are supported:Performance+ RDIMMs: 1 DPC at 3200 MHz, 2 DPC at 3200 MHzRDIMMs: 1 DPC at 3200 MHz, 2 DPC at 2933 MHz3DS RDIMMs: 1 DPC at 2933 MHz, 2 DPC at 2666 MHz
Memory maximumUp to 4TB with 32x 128GB 3DS RDIMMs
Persistent memoryNot supported.
Memory protectionECC, SDDC, Patrol/Demand Scrubbing, DRAM Address Command Parity with Replay, DRAM Uncorrected ECC Error Retry, Post Package Repair
Disk drive baysUp to 4x 3.5-inch or 12x 2.5-inch hot-swap drive bays:Front bays can be one of the following:4x 3.5-inch hot-swap SAS/SATA4x 3.5-inch hot-swap AnyBay8x 2.5-inch hot-swap SAS/SATA6x 2.5-inch hot-swap SAS/SATA + 4x 2.5-inch hot-swap AnyBay10x 2.5-inch hot-swap AnyBayRear can be one of the following:2x 2.5-inch hot-swap SAS/SATA bays2x 2.5-inch hot-swap NVMe bays2x 7mm 2.5-inch hot-swap SATA bays2x 7mm 2.5-inch hot-swap NVMe baysInternal M.2 module supporting up to two M.2 drives, for OS boot and drive storage supportSee Supported drive bay combinations for details. AnyBay bays support SAS, SATA or NVMe drives. NVMe bays only support NVMe drives. Rear drive bays can be used in conjunction with 2.5-inch front drive bays. The server supports up to 10x NVMe drives all with direct connections (no oversubscription).
Maximum internal storage2.5-inch drives:184.32TB using 12x 15.36TB 2.5-inch SAS/SATA SSDs184.32TB using 12x 15.36TB 2.5-inch NVMe SSDs28.8TB using 12x 2.4TB 2.5-inch HDDs3.5-inch drives:72TB using 4x 18TB 3.5-inch HDDs30.72TB using 4x 7.68TB 3.5-inch SAS/SATA SSDs25.6TB using 4x 6.4TB 3.5-inch NVMe SSDs
Storage controllerOnboard NVMe (no RAID)Onboard SATA (no RAID)12 Gb SAS/SATA RAID adapters:RAID 530i-8i (cacheless) supports RAID 0, 1, 10, 5, 50RAID 530i-16i (cacheless) supports RAID 0, 1, 10RAID 930-8i with 2GB flash-backed cache supports RAID 0, 1, 10, 5, 50, 6, 60RAID 930-16i with 4GB flash-backed cache supports RAID 0, 1, 10, 5, 50, 6, 60RAID 940-8i with 4GB or 8GB flash-backed cache supports RAID 0, 1, 10, 5, 50, 6, 60RAID 940-16i with 8GB flash-backed cache supports RAID 0, 1, 10, 5, 50, 6, 6012 Gb SAS/SATA non-RAID: 430-8i, 430-16i and 440-16i HBAs
Optical drive baysNo internal optical drive.
Tape drive baysNo internal backup drive.
Network interfacesDedicated 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 XClarity Controller (XCC) management processor for Wake-on-LAN and NC-SI support.
PCI Expansion slotsUp to 3x PCIe 4.0 slots, all with rear access, plus a slot dedicated to the OCP adapter. Slot availability is based on riser selection and rear drive bay selection. Slot 3 requires two processors.Four choices for rear-access slots:3x PCIe 4.0 x16 low-profile slots1x PCIe 4.0 x16 full-height half-length slot + 1x PCIe 4.0 x16 low-profile slot1x PCIe 4.0 x16 low-profile slot (also supports 2x rear 2.5-inch drive bays)2x PCIe 4.0 x16 low-profile slot (also supports 2x rear 7mm 2.5-inch drive bays)For 2.5-inch front drive configurations, the server supports the installation of a RAID adapter or HBA in a dedicated area that does not consume any of the PCIe slots.Note: Not all slots are available in a 1-processor configuration. See the I/O expansion for details.
PortsFront: 1x USB 3.1 G1 (5 Gb/s) port, 1x USB 2.0 port (also for XCC local management), External diagnostics port, optional VGA port.Rear: 3x USB 3.1 G1 (5 Gb/s) ports, 1x VGA video port, 1x RJ-45 1GbE systems management port for XCC remote management. Optional DB-9 COM serial port (installs in slot 3).Internal: 1x USB 3.1 G1 connector for operating system or license key purposes
CoolingUp to 8x N+1 redundant hot swap 40 mm fans, configuration dependent. One fan integrated in each power supply.
Power supplyUp to two hot-swap redundant AC power supplies, 80 PLUS Platinum or 80 PLUS Titanium certification. 500 W, 750 W, 1100 W and 1800 W AC options, supporting 220 V AC. 500 W, 750 W and 1100 W options also support 110V input supply. In China only, all power supply options support 240 V DC. Also available is a 1100W power supply with a -48V DC input.
VideoG200 graphics with 16 MB memory with 2D hardware accelerator, integrated into the XClarity Controller. Maximum resolution is 1920×1200 32bpp at 60Hz.
Hot-swap partsDrives, power supplies, and fans.
Systems managementOperator panel with status LEDs. Optional External Diagnostics Handset with LCD display. Models with 8x 2.5-inch front drive bays can optionally support an Integrated Diagnostics Panel. XClarity Controller (XCC) embedded management, XClarity Administrator centralized infrastructure delivery, XClarity Integrator plugins, and XClarity Energy Manager centralized server power management. Optional XClarity Controller Advanced and Enterprise to enable remote control functions.
Security featuresChassis intrusion switch, Power-on password, administrator’s password, Trusted Platform Module (TPM), supporting TPM 2.0. Servers with EPYC 7002 processors also support TPM 1.2. In China only, optional Nationz TPM 2.0. Optional lockable front security bezel.
Operating systems supportedMicrosoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware ESXi. See the Operating system support section for specifics.
Limited warrantyThree-year or one-year (model dependent) customer-replaceable unit and onsite limited warranty with 9×5 next business day (NBD).
Service and supportOptional 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.
DimensionsWidth: 440 mm (17.3 in.), height: 43 mm (1.7 in.), depth: 773 mm (30.4 in.). See Physical and electrical specifications for details.
WeightMaximum: 20.2 kg (44.6 lb)