Environment
ThinkSystem SR655 V3 complies with ASHRAE Class A2 specifications with most configurations, and depending on
the hardware configuration, also complies with ASHRAE Class A3, and Class A4 specifications. System performance
may be impacted when operating temperature is outside ASHRAE A2 specification.
Depending on the hardware configuration, SR655 V3 server also complies with ASHRAE Class H1 specification.
System performance may be impacted when operating temperature is outside ASHRAE H1 specification.
The restrictions to ASHRAE support are as follows:
• The ambient temperature must be limited to 35°C if the server has any of the following components:
– Broadcom 57454 10GBASE-T 4-port OCP
– PCIe network interface cards (NICs) at a rate greater than or equal to 100 GB
– Parts with AOC and at a rate of 25 GB
• The ambient temperature must be limited to 30°C if the server has any of the following components:
– 24 x 2.5" or 12 x 3.5" front drives
– Parts with AOC and at a rate of greater than 25 GB
– Group E (320W <= cTDP <= 400W) processors
For detailed thermal information, see
“Thermal rules” on page 41.
Note:
When the ambient temperature is greater than the supported max temperature, the server will shut down (ASHRAE 45°
C). The server will not power on again until the ambient temperature falls within the supported temperature range.
• Air temperature:
– Operating
– ASHRAE class H1: 5°C to 25°C (41°F to 77°F)
The maximum ambient temperature decreases by 1°C for every 500 m (1640 ft) increase in altitude above 900
m (2,953 ft)
– ASHRAE class A2: 10°C to 35°C (50°F to 95°F)
The maximum ambient temperature decreases by 1°C for every 300 m (984 ft) increase in altitude above 900
m (2,953 ft)
– ASHRAE class A3: 5°C to 40°C (41°F to 104°F)
The maximum ambient temperature decreases by 1°C for every 175 m (574 ft) increase in altitude above 900
m (2,953 ft)
– ASHRAE class A4: 5°C to 45°C (41°F to 113°F)
The maximum ambient temperature decreases by 1°C for every 125 m (410 ft) increase in altitude above 900
m (2,953 ft)
– Server off: 5°C to 45°C (41°F to 113°F)
– Shipment/storage: -40°C to 60°C (-40°F to 140°F)
• Maximum altitude: 3,050 m (10,000 ft)
• Relative Humidity (non-condensing):
– Operating
– ASHRAE class H1: 8%–80%; maximum dew point: 17°C (62.6°F)
– ASHRAE class A2: 8%–80%; maximum dew point: 21°C (70°F)
– ASHRAE class A3: 8%–85%; maximum dew point: 24°C (75°F)
– ASHRAE class A4: 8%–90%; maximum dew point: 24°C (75°F)
– Shipment/storage: 8% to 90%
Chapter 1. Introduction 7
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