Table 1. Specifications (continued)
Specification
Description
System fans Your server comes with the following fans to provide proper system cooling and airflow:
• One heat sink and fan assembly
• Two front system fans
• One rear system fan
Electrical input Universal input:
• Low range: 100 to 127 V ac
• High range: 200 to 240 V ac
• Input frequency range: 50 to 60 Hz
Note: The ThinkSystem ST250 only supports AC input power. Do not use 240VDC
input.
Power supply The server might come with one of the following power supply configurations:
• One 250W fixed power supply
• One or two 550W redundant power supply
Note: If you are using uninterruptible power supplies (UPS), ensure that you use only
pure-sine UPS with your ThinkServer server.
Acoustical noise
emissions
• Sound power, idling
– 3.7 bels, minimum
– 3.8 bels, typical
– 4.3 bels, maximum
• Sound power, operating
– 3.7 bels, minimum
– 4.0 bels, typical
– 4.4 bels, maximum
• Sound pressure level, idling (tabletop)
– 26.8 dBA, minimum
– 26.5 dBA, typical
– 39.4 dBA, maximum
• Sound pressure level, operating (tabletop)
– 27.0 dBA, minimum
– 26.7 dBA, typical
– 40.1 dBA, maximum
• Sound pressure level, idling (floor)
– 19.3 dBA, minimum
– 19.5 dBA, typical
– 29.5 dBA, maximum
• Sound pressure level, operating (floor)
– 19.4 dBA, minimum
– 21.0 dBA, typical
– 32.3 dBA, maximum
Note:
The sound levels were measured in controlled acoustical environments according to
procedures specified by ISO 7779 and are reported in accordance with ISO 9296. The
declared acoustic noise levels are based on specified configurations, which may change
slightly depending on configuration/conditions.
Approximate heat output
• Minimum configuration: 221 BTU , 65 W (in BTU per hour and watts)
• Maximum configuration: 699 BTU, 205 W (in BTU per hour and watts)
8 ThinkSystem ST250 Setup Guide
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