Dell PowerEdge R940 EMC Technical Specifications - Page 13

Table 17. Expanded operating temperature specifications (continued) Expanded operating temperature Specifications NOTE: Outside the standard operating temperature (10°C to 35°C), the system can operate continuously in temperatures as low as 5°C and as high as 40°C. For temperatures between 35°C to 40°C, de-rate maximum allowable temperature by 1°C per 175 m above 950 m (1°F per 319 ft). ≤ 1% of annual operating hours -5°C to 45°C at 5% to 90% RH with 29°C dew point. NOTE: Outside the standard operating temperature (10°C to 35°C), the system can operate down to -5°C or up to 45°C for a maximum of 1% of its annual operating hours. For temperatures between 40°C and 45°C, de-rate maximum allowable temperature by 1°C per 125 m above 950 m (1°F per 228 ft). NOTE: When operating in the expanded temperature range, system performance may be impacted. NOTE: When operating in the expanded temperature range, ambient temperature warnings may be reported in the System Event Log. Expanded operating temperature restrictions • Do not perform a cold startup below 5°C. • The operating temperature specified is for a maximum altitude of 3050 m (10,000 ft). • 150 W/8 core, 165 W/12 core and higher wattage processor [Thermal Design Power (TDP)>165 W] are not supported. • Redundant power supply unit is required. • Non-Dell qualified peripheral cards and/or peripheral cards greater than 25 W are not supported. • NVMe drives are not supported. • NVDIMMs are not supported. • DCPMMs are not supported. • Tape backup unit is not supported. Thermal restrictions Following table lists the configuration required for efficient cooling. Table 18. Thermal restriction for efficient cooling Configuration Number of processor s Heatsink Eight 2.5 inch 2 hard drive system Two heat sinks for CPU < 165W Two heat sinks for CPU ≥ 165 W Processor blank Not required DIMM blanks Fresh air 12 Yes No Fan eight standard fans 4 Twenty four 2 2.5 inch hard drive system 4 Four standard heat sinks for Not required CPU < 165 W Four heat sinks CPU ≥ 165 W Two standard heat sinks for Not required CPU < 165W Two heat sinks for CPU ≥ 165 W Four standard heat sinks for Not required CPU < 165 W 24 Yes No 12 Yes No 24 Yes eight standard fans eight standard fans eight standard fans PowerEdge R940 technical specifications 13