Dell M820 owner manual For temperatures between 35 C and 40 C, de-rate

Environmental

		NOTE: Outside the standard operating
		temperature (10 °C to 35 °C), the system can
		operate down to 5 °C or up to 40 °C for a
		maximum of 10% of its annual operating hours.
	For temperatures between 35 °C and 40 °C, de-rate
	maximum allowable dry bulb 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 26 °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 dry bulb temperature by 1
	°C per 125 m above 950 m (1 °F per 228 ft).
Expanded operating temperature restrictions	• Do not perform a cold startup below 5 °C
	• Install only 87 mm wide heat sinks
	• Do not install more than 40 DIMMs
	• The following do not support expanded
	operating temperature range:
	–	PCIe SSD
	–	Express flash
	–	LRDIMMs
	– 130 W four-core processors

– Non Dell-qualified peripheral cards and/or peripheral cards greater than 25 W

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