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Thermal rules

This topic provides thermal rules for the server.

Note

  • The maximum supported DIMM quantity is 12.

  • cTDP is short for Configurable Thermal Design Power. It refers to the maximum supported power of a processor.

Processor groups are defined as follows:

  • Group B: 200 W ≤ cTDP ≤ 240 W

  • Group A: 240 W < cTDP ≤ 300 W

  • Group E: 320 W ≤ cTDP ≤ 400 W

Heat sink types and fan types in the tables are abbreviated as follows:

  • Air cooling heat sink: AC

  • Closed loop heat sink: CL

  • Performance fan: Perf

  • Standard fan: Std

Typical configurations: server models with front drive bays only​

This section provides thermal information for server models with front drive bays only.

Note
When ThinkSystem 128GB TruDDR5 4800MHz (4Rx4) 3DS RDIMM-A v1 is used, performance fans must be installed.
Front baysMax. Ambient Temp. (at sea level)Processor group (A, B, E)Heat sinkFan type

  • 10 x 2.5" NVMe

  • 10 x 2.5" AnyBay1

  • 10 x 2.5" SAS/SATA

  • 8 x 2.5'' SAS/SATA

  • 6 x SAS/SATA + 4 x AnyBay

  • 6 x SAS/SATA + 2 x AnyBay + 2 x NVMe

35°CBACStd
35°CBAC/CL1Perf
35°CAAC/CL1Perf
45°CBACPerf
40°CAACPerf
25°CE (9654/9654P processors only)AC/CL1Perf
30°CECL1Perf
35°CE (9654/9654P/9554/9554P/9174F/9474F/9754/9734 processors only)CL1Perf

16-EDSFF

30°CA and BACPerf
25°CE (9654/9654P only)ACPerf

Using 10 x 2.5'' chassis

  • 4 x 2.5'' SAS/SATA

  • 4 x 2.5'' NVMe

  • 4 x 2.5'' AnyBay

35°CBAC/CLPerf
45°CBACPerf
40°CAACPerf
25°CE (9554/9554P/9754/9734 processors)AC/CLPerf
30°CE (9174F processors only)AC/CLPerf
35°CE (9654/9654P processors only)AC/CLPerf
35°CECLPerf

Using 4 x 2.5'' chassis

  • 4 x 2.5'' SAS/SATA

  • 4 x 2.5'' NVMe

  • 4 x 2.5'' AnyBay

45°CBACPerf
40°CAACPerf
25°CE (9654/9654P processors only)ACPerf
Note
  1. When a 10 x 2.5" AnyBay backplane is used, only the following two configurations support closed loop heat sink:

    • 10 x 2.5" NVMe (Gen 4)

    • 8 x 2.5" NVMe (Gen 5)

  2. System performance may be impacted when the operating temperature is above 35 °C.

Storage configurations: server models with rear bays​

This section provides thermal information for the storage configuration when rear drives (except 7mm drives) are installed.

Note

ThinkSystem 128GB TruDDR5 4800MHz (4Rx4) 3DS RDIMM-A v1 is not supported when rear drives (except 7mm drives) are installed.

Front bays

Max. Ambient Temp.

(at sea level)

Processor group

Heat sinkFan type

  • 10 x 2.5" SAS/SATA

  • 10 x 2.5" NVMe

  • 6 x 2.5" SAS/SATA + 4 x 2.5" AnyBay

30°CA and BACPerf
25°CE (9654/9654P processors only)ACPerf

Using 4 x 2.5" chassis:

  • 4 x 2.5" AnyBay

  • 4 x 2.5" NVMe

30°CA and BACPerf
25°CE (9654 and 9654P processors only)ACPerf
Note

  • To support rear 2 x 2.5" SAS/SATA or NVMe (U.2/U.3) drives, the following conditions need to be met:

    • Gen 4 low-profile riser installed in Riser 1

    • No Riser 2 installed

    • No 7mm drives

    • No PCIe adapter installed in slot 2 and slot 3

  • 10 x 2.5" AnyBay front backplanes support rear NVMe (U.2/U.3) drives but do not support rear SAS/SATA drives.

GPU configurations: server models with GPU adapters​

This section provides thermal information for the GPU configuration.

The server supports the following GPUs:
  • Low-profile, half-length, single-wide:

    • NVIDIA® A2

    • NVIDIA® L4

Note

  • All GPU configurations require performance fans.

  • ThinkSystem 128GB TruDDR5 4800MHz (4Rx4) 3DS RDIMM-A v1 is not supported when GPUs are installed.

Front bays

Max. Ambient Temp.

(at sea level)

Processor group

Heat sinkMax. GPU Qty.Supported GPU installation slot (s)

  • 10 x 2.5" AnyBay

  • 10 x 2.5" NVMe

  • 10 x 2.5" SAS/SATA

  • 8 x2.5'' SAS/SATA

  • 6 x 2.5" SAS/SATA + 4 x 2.5" AnyBay

  • 6 x 2.5" SAS/SATA + 2 x 2.5" AnyBay + 2 x 2.5" NVMe

30°CBAC31, 2, 3
35°CAAC11
25°CE (9654/9654P processors only)AC11

16-EDSFF

30°CA and BAC31, 2, 3
25°CE (9654/9654P processors only)AC11

Using 10 x 2.5'' chassis

  • 4x2.5'' SAS/SATA

  • 4x2.5'' NVMe

  • 4 x 2.5'' AnyBay

35°CA and BAC31, 2, 3
30°CECL31, 2, 3
30°CE (9654/9654P/9174F processors only)AC31, 2, 3
25°CE (9554/9554P/9754/9734 processors only)AC31, 2, 3

Using 4 x 2.5'' chassis

  • 4 x 2.5'' SAS/SATA

  • 4 x 2.5'' NVMe

  • 4 x 2.5'' AnyBay

30°CBAC41, 2, 3, 5
35°CAAC21, 5
25°CE (9654/9654P processors only)AC11

Thermal rules for 256 GB 3DS RDIMMS​

This section provides thermal information when ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM-A v1 is installed.

Note
ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM-A v1 is not supported when rear drives (except 7mm drives), GPU adapters or PCIe/OCP adapters (≥ 100GB) are installed.
Front bays

Max. Ambient Temp.

(at sea level)

Processor group

Heat sinkFan type

  • 10 x 2.5" AnyBay

  • 10 x 2.5" NVMe

  • 10 x 2.5" SAS/SATA

  • 8 x 2.5'' SAS/SATA

  • 6 x 2.5" SAS/SATA + 4 x 2.5" AnyBay

  • 6 x 2.5" SAS/SATA + 2 x 2.5" AnyBay + 2 x 2.5" NVMe

25°CA and BACPerf

16-EDSFF

25°CA and BACPerf

Using 10 x 2.5'' chassis

  • 4 x 2.5'' SAS/SATA

  • 4 x 2.5'' NVMe

  • 4 x 2.5'' AnyBay

30°CA and BACPerf
25°CA, B and ECLPerf

Using 4 x 2.5'' chassis

  • 4 x 2.5'' SAS/SATA

  • 4 x 2.5'' NVMe

  • 4 x 2.5'' AnyBay

25°CA and BACPerf

Server models with PCIe/OCP adapters (≥ 100 GB) installed​

  • AOC: active optical cables

  • DAC: direct attach cables

Note
Performance fans are needed for the following conditions.
Front baysMax. Ambient Temp. (at sea level)ProcessorHeat sinkMax. PCIe/OCP QtySuggested slotsCable supported

  • 10 x 2.5" AnyBaynote

  • 10 x 2.5" NVMe

  • 10 x 2.5" SAS/SATA

  • 8 x 2.5'' SAS/SATA

  • 6 x 2.5" SAS/SATA + 4 x 2.5" AnyBay

  • 6 x 2.5" SAS/SATA + 2 x 2.5" AnyBay + 2 x 2.5" NVMe

30°CA and BAC31, 2, 3AOC/DAC
25°CA and BCLnote31, 2, 3AOC/DAC
25°CE (9654/9654P processors only)AC/CLnote31, 2, 3without 100G AOC
30°CA, B, and ECLnote31, 2, 3without 100G AOC
16-EDSFF30°CA and BAC31, 2, 3AOC/DAC
25°CE (9654/9654P processors only)AC31, 2, 3without 100G AOC

Using 10 x 2.5'' chassis

  • 4 x 2.5'' SAS/SATA

  • 4 x 2.5'' NVMe

  • 4 x 2.5' AnyBay

30°CA and BAC31, 2, 3AOC/DAC
25°CECLnote31, 2, 3AOC/DAC
25°CE (9654/9654P/9174F/9554/9554P/9754/9734 processors only)AC/CLnote31, 2, 3AOC/DAC
30°CE (9654/9654P/9174F processors only)AC31, 2, 3AOC/DAC
30°CECLnote31, 2, 3without 100G AOC

Using 4 x 2.5'' chassis

  • 4 x 2.5'' SAS/SATA

  • 4 x 2.5'' NVMe

  • 4 x 2.5'' AnyBay

30°CA and BAC51, 2, 3, 4, 5AOC/DAC
25°CE (9654/9654P processors only)AC51, 2, 3, 4, 5without 100G AOC
Note
When a 10 x 2.5" AnyBay backplane is used, only the following two configurations support closed loop heat sink:

  • 10 x 2.5" NVMe (Gen 4)

  • 8 x 2.5" NVMe (Gen 5)

Fan locations and supported quantity for different configurations​

The supported fan quantity and suggested installation slots vary with different configurations. See the following table for details.

ConfigurationsLimiting conditionsFan quantityFan typeFan locations (slots)Fan dummy quantity

  • 16-EDSFF

  • 4 x 2.5'' SAS/SATA

  • 4 x 2.5'' NVMe

  • 4 x 2.5' AnyBay

N/A7Perf1, 2, 3, 4, 5, 6, 71

  • 10 x 2.5" AnyBay

  • 10 x 2.5" NVMe

  • 10 x 2.5" SAS/SATA

  • 8 x 2.5'' SAS/SATA

  • 6 x 2.5" SAS/SATA + 4 x 2.5" AnyBay

  • 6 x 2.5" SAS/SATA + 2 x 2.5" AnyBay + 2 x 2.5" NVMe

  • cTDP ≤ 240 W

  • No GPU adapter

  • No rear backplane

  • No PCIe/OCP adapter (≥ 100 GB)

6Std1, 2, 3, 4, 5, 62
Other scenarios except the above6Perf1, 2, 3, 4, 5, 62