Lenovo ThinkSystem SR650 Product Manual page 26

Configuration note: If processors with 200 W or 205 W TDP are used, or if Gold 6126T, 6144, or 6146, or Platinum
8160T processors are used, the following conditions must be met:
24x 2.5" chassis only
Ambient temperature:
Up to 35 °C (95 °F)
Except Gold 6137: 8x 2.5" SAS/SATA drive bays (drive backplane in the middle)
Up to 30 °C (86 °F)
Gold 6137 only: 8x 2.5" SAS/SATA drive bays (drive backplane in the middle)
Except Gold 6137:
No rear HDD kit installed
No PCIe flash adapters installed
No GPUs installed
No Intel OPA adapters installed
No Mellanox ConnectX-3 Pro ML2 FDR 2-Port QSFP VPI Adapter installed
No RAID 930-24i installed
The server performance might be impacted in case of a fan failure
Memory
The SR650 server supports up to 12 TruDDR4 memory DIMMs with one processor and up to 24 DIMMs when two
processors are installed. Each processor has six memory channels, and there are two DIMMs per channel.
Lenovo TruDDR4 memory uses the highest-quality components sourced from Tier 1 DRAM suppliers and only
memory that meets strict requirements is selected. It is compatibility tested and tuned on every ThinkSystem
server to maximize performance and reliability.
TruDDR4 memory has a unique signature programmed into the DIMM, which enables Lenovo servers to verify
whether the memory installed is qualified and supported. Lenovo qualified and supported TruDDR4 memory is
covered by Lenovo warranty, and service and support provided worldwide.
The following rules apply when selecting the memory configuration:
The server supports RDIMMs, LRDIMMs, or 3DS RDIMMs.
Mixing different types of memory (RDIMMs, LRDIMMs, and 3DS RDIMMs) is not supported.
Mixing x4 and x8 RDIMMs and RDIMMs of different capacity is supported.
All DIMMs in the server operate at the same speed up to 2666 MHz, which is determined by the maximum
memory speed supported by the specific processor.
Note: Maximum memory speed can be achieved when Max performance mode is enabled in UEFI.
The following maximum memory capacities supported by the server:
RDIMMs: 768 GB (384 GB per processor).
LRDIMMs: 1.5 TB (768 GB per processor).
3DS RDIMMs: 3 TB (1.5 GB per processor) (requires processors that support 1.5 TB of memory per
socket).
The following memory protection technologies are supported:
ECC
SDDC (for x4-based memory DIMMs)
ADDDC (for x4-based memory DIMMs; Gold and Platinum processors only)
Memory mirroring
Memory rank sparing
Patrol scrubbing
Demand scrubbing
Single Device Data Correction (SDDC) works only in the independent channel mode (the default operational mode)
and supports only x4-based memory DIMMs.
Adaptive Double Device Data Correction (ADDDC) works with x4-based memory DIMMs and requires two
DIMM ranks per channel, Intel Xeon Gold or Platinum processors, and the Closed Page memory access mode.
Lenovo ThinkSystem SR650 Server
4x 2.5" SAS/SATA and 4x 2.5" AnyBay (up to 4 NVMe SSDs)
8x 2.5" SAS/SATA and 8x 2.5" AnyBay (up to 8 NVMe SSDs)
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