Table 1. Server Specifications (continued)
Specification
Description
Acoustical noise emissions
(base configuration)
• Sound power, idling: 6.1 bels
• Sound power, operating: 6.1 bels
Note: The options supported in this server vary in function, power consumption, and
required cooling. Any increase in cooling required by these options will increase the
fan speed and generated sound level. The actual sound pressure levels measured in
your installation depend upon a variety of factors, including: the number of racks in
the installation; the size, materials, and configuration of the room; the noise levels of
other equipment; the room ambient temperature and barometric pressure; and the
location of employees in relation to the equipment.
Heat output Approximate heat output:
• Minimum configuration: 935 BTU, 275 W (in BTU per hour and watts)
– Minimum configuration of two microprocessors, two memory modules, one M.2
adapter, and no PCIe adapters.
• Maximum configuration: 21837 BTU, 6400 W (in BTU per hour and watts)
– Maximum configuration with four 1600–watt power supplies configured for
non-redundant operation under maximum loading.
Environment
• Air temperature:
– Server on: 5° to 45°C (41° to 113°F); altitude: 0 to 3050 m (10,006 ft) derate
maximum dry bulb temperature 1°C (33°F) per 125 m (410 ft) above 950 m
(3,117 ft). Maximum rate of change 20°C (68°F) per hour
– Server off: 5° to 45°C (41° to 113°F)
– Shipment: -40°C to 60°C (-40°F to 140°F)
• Humidity range (noncondensing):
– Server on: Minimum = higher (more moisture) of -12°C (10°F) dew point and 8%
to 90% relative humidity; maximum dew point: 24°C (75°F)
– Server off: 8% to 90% relative humidity; maximum dew point: 27°C (80°F)
– Shipment: 5% to 100%
Notes:
• Airborne particulates and reactive gases acting alone or in combination with other
environmental factors such as humidity or temperature might pose a risk to the
server. For information about the limits for particulates and gases, see
Particulate
contamination
.
• ASHRAE compliance information (see the “Operating Environment” section of
the
Lenovo ThinkSystem SR950 Product Guide at http://lenovopress.com/LP0647
for
specific ASHRAE compliance levels for each server configuration):
– The server is designed for thermal compliance in ASHRAE A4 ambient
environments. Certain processor and adapter configurations will limit product
environmental support to ASHRAE A2 ambient conditions.
– 205W processors used in an eight-socket configuration might experience a
slight drop in performance under extreme workloads when the ambient
temperature is above 30°C.
– NVMe devices are supported up to an ambient temperature of 35°C.
Chapter 1. Introduction 7
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