10. Rendering With Povray

As previously mentioned, the Celeron M doesn't offer Speedstep energy saving technology and always runs at the maximum clock speed. In comparison, with a Pentium M, the core frequency can be either dynamically adjusted to the power requirements, or optionally reduced to a fixed value of 600 MHz. The prerequisite for this is that the user selects the corresponding energy scheme in the control panel (Max. Battery when running on battery).

However, the Celeron M's core clock speed can also be set to a lower fixed value. For this purpose, the Latitude D505 provides a way to select the processor's clock speed in the BIOS. If the user decides in favor of the option "Compatible", then the CPU boots and runs with a fixed, considerably lower clock speed. The lower clock speed is most likely achieved by clock gating. The times that were measured for the two different BIOS settings showed that the core speed was approximately 300 MHz if the value "Compatible" were selected for the CPU boot speed.

If the computer is to once again provide maximum performance, a reboot is necessary and the appropriate setting must be made in the BIOS.