Table 1. Server Specifications
Specification
Description
Size
4U server
• Height: 175.3 mm (6.90 in.)
• Depth: 851 mm (33.50 in.)
• Width: 447.0 mm (17.6 in.)
Weight Approximately 32.6 kg (71.9 lbs.) to 58.7 kg (129.4 lbs.) depending on your
configuration.
Processor (depending on the
model)
Supports multi-core Intel Xeon processors, with integrated memory controller and
Ultra Path Interconnect (UPI)
• Two processors, minimum (expandable up to eight).
• Designed for the LGA 3647-0 socket
• Scalable up to 224 cores (with eight processors installed)
For a list of supported processors, see
https://static.lenovo.com/us/en/serverproven/
index.shtml
and the “Processor Options” section of the ThinkSystem SR950 Product
Guide at http://lenovopress.com/LP0647
.
Note: If 82xx processors are installed, 60 mm x 38mm, 19K internal hot-swap fans
(01PG490) must also be installed to meet CPU cooling requirements at 35°C. If 16K
internal hot-swap fans are currently installed, you must validate that the system has
version 2 of the ThinkSystem 2-CPU, 24-DIMM, Compute System Board (01CV978)
installed in each compute tray before upgrading the fans from 16K to 19K.
Memory See “Memory module installation rules and order” on page 58 for detailed
information about memory configuration and setup.
• Minimum: 32 GB
• Maximum:
– 6.2 TB using registered DIMMs (RDIMMs) or load reduction DIMMs (LRDIMMs)
– 24.6 TB using three-dimensional-stacking registered DIMMs (3DS RDIMMs)
– 36.9 TB using Intel® Optane
TM
DC persistent memory modules (PMMs)
• Type:
– PC4-21300 (DDR4-2666), operating speed depends on processor model and
UEFI settings
– Single-rank or dual-rank
– Registered DIMM (RDIMM), load reduced DIMM (LRDIMM), or three-
dimensional-stacking registered DIMM (3DS RDIMM)
• Slots: 24 dual inline in each compute tray (96 DIMMs, maximum)
• Supports (depending on the model):
– 16 GB, 32 GB, 64 GB RDIMMs
– 64 GB LRDIMMs
– 64 GB, 128 GB, 256 GB 3DS RDIMMs
– 128 GB, 256 GB, and 512 GB Intel® Optane
TM
DC persistent memory modules
(DCPMMs)
Note: When Windows Server 2016 or 2019 is installed on the ThinkSystem SR950,
the server cannot have greater than 20 TB of system memory installed unless
Credential Guard and the Hyper-V role are both disabled. This issue will be
addressed on Windows Server 2019 within a Microsoft Update at a future date. Note
that Optane DIMMs are only supported on Windows Server 2019 and later.
4 ThinkSystem SR950 Setup Guide
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