Is this the original CPU, or did you upgrade it?

If you upgraded it, did you use a Mobile P4-m? The system will work at full speed ONLY with a Mobile P4-m - a mobile P4 without the -m will not run at full speed.

Is the SpeedStep active in the Bios? This has to be done at start up (hit F2 for set up)

What OS are you running? In XP you have to adjust the power settings to get 100%

Think you need to enable SpeedStep in your BIOS Setup.

You may need to install, or reinstall:

Click here for: Intel SpeedStep, Driver, Multi OS, English, Multi System, v. 2.3, A11 Release Date: 05/23/2002 

Description:
Intel® SpeedStep™ technology lets you customize high performance computing on your mobile PC.
When the notebook computer is connected to the AC outlet, the new mobile PC runs the most complex business and
Internet applications with speed virtually identical to a desktop system. When powered by a battery, the processor drops to a lower frequency
(by changing the bus ratios) and voltage, conserving battery life while maintaining a high level of performance.
Manual override lets you boost the frequency back to the near maximum frequency when on battery, allowing you to customize performance.

Fixes and Enhancements
The v2.3 release fixes the issue where the system was getting set to the
incorrect performance state upon resume from suspend/hibernate after
processing the system resume suspend message.

The v2.3 release also fixes the issue where both Automatic and Max
Battery modes (DBS) would be disabled upon resume from suspend/hibernate
under Windows 98SE and Windows ME operating systems and on Windows 2000
operating system when Timer/TSC mechanism is used to calculate CPU
utilization. This method is used by the applet only if the OS API's used
to compute utilization fail or if the registry entry "W2KTimer" is set to
0 (zero).

The v2.3 release also fixes the issue that when PRPC_UpdateSettings()
external interface is called, both Automatic and Max Battery modes (DBS)
would get disabled under Windows 98SE and Windows ME operating systems
and on Windows 2000 operating system when Timer/TSC mechanism is used to
calculate CPU utilization. This method is used by the applet only if the
OS API's used to compute utilization fail or if the registry
entry "W2KTimer" is set to 0 (zero).

Installation Instructions ..."

Another excellent Tool for C840 users running WinXP is:

SpeedswitchXP - CPU frequency control for notebooks running Windows XP

"...On Windows 2000 and previous operating systems, it was possible to manually control the CPU frequencies with a SpeedStep applet provided by Intel,
but this is not possible anymore under Windows XP. ..."

For WinXP users, the above not only allows complete control of CPU Speed, it provides the BEST Power Management Profile Setting tools.

Message Edited by Art on 01-30-2006 11:54 AM

Thanks, Art. Tried it and the speed is still only 1.6GHz. The speed step icon says it is at maximum still. So I think for some reason the speed step technology doesn't know the true maximum speed of the processor.

Which 2.4 are you running?

The lower speed for these should be 1.2Ghz I'm wondering why you're getting 1.6?