Dell PowerEdge M820 Technical Manual page 29

Thermal control also detects and responds to hardware configuration. Thermal management
adjusts cooling according to what the system really needs, and draws lower fan power draw and
generates lower acoustical noise levels than those without such controls.
 Environmental specifications: The optimized thermal management makes the PowerEdge
M820 reliable under a wide range of operating environments as shown in Table 24.
The acoustical performance of the PowerEdge M820 is reflected in Table 16. The addition of some
components can cause an increase in fan speed and acoustical output. Contributors to acoustical
output can include:
 The system thermal profile selected in BIOS (for example, Power optimized DAPC or
Performance optimized)
NDC

 Number of installed processors
Population of modular, non-homogenous modular deployment

Impedance of blanks

Configuration
CPUs
(23 ± 2°C
ambient)
2 x 95W
Minimum
(6 core)
2 x 95W
Typical
(8 core)
1
L -UL is the upper limit sound power levels (L
WA
accordance to ISO 7779 (2010).
2
L is the average A-weighted sound pressure level of four bystanders in accordance with ISO 7779 (2010) Section 8.6.2.
pA
The system is placed inside 42U rack in 25cm height.
3
Standby: AC Power is connected to power supply units but the system is not turned on.
4
Idle: Reference ISO 7779 (2010) definition 3.1.7; system is running in its operating system but no other specific activity.
Note: Stress is an operating mode per ISO 7779 (2010) definition 3.1.6. Since blade stressing applications vary widely,
blade stress values are not available.
PowerEdge M820 Technical Guide
29
Hard HDD
DIMMs
drives controller
1 x 2.5"
2 x PERC H310
SATA
2GB (mini)
(7.2K)
2 x 2.5"
16 x PERC H710
SAS
8GB (mini)
(10K)
) calculated per section 4.4.1 of ISO 9296 (1988) and measured in
WA
Operating
NDC PCI cards
mode
Standby
Any mezz.
None
card
Idle
Standby
Any mezz.
1Gb
card
Idle
1 2
L -UL L
WA pA
(bels) (dBA)
3
6.9 51
4
7.4 55
3
6.9 52
4
7.3 55