Dell OptiPlex SX270 User Manual page 36

Standby–In this sleep state, power is reduced or turned off for most components, including the cooling fans. However, system memory remains active.
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This state is not supported by Windows NT 4.0.
NOTE: All components installed in the computer must support this feature and have the appropriate drivers loaded to enter standby. For more
information, see the manufacturer's documentation for each component.
Hibernate–This sleep state reduces power consumption to a minimum by writing all data in system memory to a hard drive and then removing system
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power. Waking up from this state restarts the computer, and the memory contents are restored. Operation then resumes where the computer left off
when it entered the hibernation state.
This state is not supported by Windows NT 4.0.
NOTE: All components installed in the computer must support this feature and have the appropriate drivers loaded to enter hibernation. For more
information, see the manufacturer's documentation for each component.
Shutdown–This sleep state removes all power from the computer except a small auxiliary amount. As long as the computer remains connected to an
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electrical outlet, it can be automatically or remotely started. For example, the Auto Power On option in
automatically start at a specified time. Also, your network administrator can remotely start your computer using a power management event such as
Remote Wake Up.
The following table lists the sleep states and the methods you can use to wake the computer from each state.
Sleep State Wake-Up Methods (Windows 2000 and XP)
Standby Press the power button
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Auto power on
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Move or click the mouse
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Type on the keyboard
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USB device activity
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Power management event
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Hibernate Press the power button
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Auto power on
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Power management event
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Shutdown Press the power button
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Auto power on
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Power management event
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NOTE: For more information on power management, see your operating system documentation.
Hyper-Threading
Hyper-Threading is an Intel® technology that can enhance overall computer performance by allowing one physical microprocessor to function as two logical
microprocessors, capable of performing certain tasks simultaneously. It is recommended that you use the Microsoft® Windows® XP SP1 or later operating
system because Windows XP is optimized to take advantage of Hyper-Threading technology. While many programs can benefit from Hyper-Threading, some
programs have not been optimized for Hyper-Threading and may require an update from the software manufacturer. Contact the software manufacturer for
updates and information about using Hyper-Threading with your software.
To determine if your computer is using Hyper-Threading technology:
1. Click the Start button, right-click My Computer, and then click Properties.
2. Click Hardware and click Device Manager.
3. In the Device Manager window, click the plus (+) sign next to the processor type. If Hyper-Threading is enabled, the processor is listed twice.
You can enable or disable Hyper-Threading through
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system setup.
system setup allows the computer to