Lenovo ThinkSystem ST550 Product Manual page 57

Operating environment
The ThinkSystem ST550 server complies with ASHRAE Class A2 specifications, 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.
The following restrictions apply with ASHRAE A4 and A3 support:
No support for processors with TDP rating of 125 W or higher
Two power supplies must be installed; fixed (cabled) power supply not supported
The rear fan must be installed
No support for NVMe drives
No support for GPUs
If the media bay conversion kit is installed (adding 4x 2.5-inch drive bays), those drive bays cannot
support SAS drives (HDD or SSD) that are 2TB or larger. SATA drives are fully supported.
In addition, CPU core speed may be reduced depending on the processor selected.
The server is supported operating in the following environments:
ASHRAE A2:
Temperature: 10°C to 35°C
Humidity: 20% to 80%
Altitude 0-3000 m (10,000 ft), derated 1°C per 300 m above 950 m
ASHRAE A3:
Temperature: 5°C to 40°C
Humidity: 8% to 85%
Altitude 0-3000 m (10,000 ft), derated 1°C per 175 m above 950 m
ASHRAE A4:
Temperature: 5°C to 45°C
Humidity: 8% to 90%
Altitude 0-3000 m (10,000 ft), derated 1°C per 125 m above 950 m
Non-operating environment support:
Without packaging:
Temperature: -10 °C to 60 °C
Humidity: 8 to 90%
Storage with packaging:
Temperature: -40 °C to 70 °C
Humidity: 8 to 90%
Thermal (heat) output:
Maximum configuration: 4074 Btu/hr (1194 watts)
Acoustical noise emissions:
Sound power levels (bels):
Base configuration: 4.0 bels (idle), 4.1 bels (operating)
Maximum configuration: 5.3 bels (idle), 5.3 bels (operating)
Sound pressure levels (dBA):
Base configuration: 33 dBA (idle), 33 dBA (operating)
Maximum configuration: 43 dBA (idle), 43 dBA (operating)
Lenovo ThinkSystem ST550 Server 57