Lenovo ThinkSystem SR645 Maintenance Manual page 16

Table 1. Server specifications (continued)
Specification
System fans
Minimal configuration for
debugging
Acoustical noise emissions
ThinkSystem SR645 Maintenance Manual
6
Description
For technical rules for storage controller adapters, see Technical rules for PCIe
adapters.
Up to eight dual-rotor hot-swap fans (including two redundant fans)
• Standard fan 4056 (21000 RPM)
• Performance fan 4056 (24000 RPM)
For technical rules for system fans, see Technical rules for system fans.
• One processor in processor socket 1
• One memory module in slot 14
• One power supply
• One HDD/SSD drive, one M.2 drive, or one 7mm drive (if OS is needed for
debugging)
• Six system fans (with one processor)
• Sound power levels, idle
– 6.0 bels, typical
– 6.9 bels, maximum
• Sound power levels, operating
– 6.5 bels, typical
– 6.9 bels, maximum
Notes:
• These sound power levels are 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.