System Fans And Airflow; Resetting The Power Supply - HP Xw8400 - Workstation - 4 GB RAM Technical Reference Manual

Table 1-10 Example 2 energy consumption (continued)
Sleep (S3)*
Off (S5)
* Energy Star low energy mode.
This product is in compliance with US executive order 13221, WOL (wake on LAN) disabled.
Table 1-11 Example 2 heat dissipation**
Windows Idle (S0)
Windows Busy Typ (S0)
Windows Busy Max (S0)
Sleep (S3)*
Off (S5)
* Energy Star low energy mode.
* Heat dissipation calculation is based on measured watts, assuming the service level is attained for one hour.
This product is in compliance with US executive order 13221, WOL (wake on LAN) disabled.
NOTE: When you power down your workstation with the power button on the front panel, the power
consumption falls below 10 W. To reach zero power consumption, unplug the workstation from the power
outlet or use a power strip with a switch. For additional information on power-saving features, see your
operating system documentation.
For additional information on power-saving features, see your operating system documentation.

System fans and airflow

The workstation includes one rear system fan, one memory fan, one processor (CPU) heatsink fan for
each processor, and one power supply fan, plus optional front system fans.

Resetting the power supply

If an overload triggers the power supply overload protection, all power is immediately shut off. To reset
the power supply unit:
1. Disconnect the power cord.
2. Determine what caused the overload, and fix the problem.
3. Reconnect the power cord, and reboot the workstation.
When you power down the workstation through the operating system, power consumption falls below
the low power consumption rate but does not reach zero. This on/off feature extends the life of the power
supply.
ENWW
7.4 W 5.7 W
2.4 W 1.3 W
115 VAC
LAN enabled LAN disabled
1092 BTU/hr
1643 BTU/hr.
2065 BTU/hr
25.3 BTU/hr 19.5 BTU/hr
8.2 BTU/hr. 4.4 BTU/hr.
8.1 W 6.8 W
3.0 W 1.8 W
230 VAC
LAN enabled LAN disabled
1072 BTU/hr
1628 BTU/hr.
2027 BTU/hr
27.6 BTU/hr 23.2 BTU/hr
10.2 BTU/hr. 6.1 BTU/hr.
Product specifications
6.9 W 6.0 W
2.4 W 1.2 W
100 VAC
LAN enabled LAN disabled
1116 BUT/hr
1677 BTU/hr.
2084 BTU/hr
23.5 BTU/hr 20.5 BTU/hr
8.2 BTU/hr. 4.1 BTU/hr.
9