A new update is available for Fedora Core - Fedora Core 4 Update: cpuspeed-1.2.1-1.23_FC4. Here the announcement:

Fedora Update Notification
FEDORA-2005-923
2005-10-03
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Product : Fedora Core 4
Name : cpuspeed
Version : 1.2.1
Release : 1.23_FC4
Summary : CPU Frequency adjusting daemon.
Description :
cpuspeed is a daemon that dynamically changes the speed
of your processor(s) depending upon its current workload
if it is capable (needs Intel Speedstep, AMD PowerNow!,
or similar support).

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* Fri Sep 23 2005 Dave Jones <davej@redhat.com>
- Use ACPI as a fallback driver if none is set, and its available. (#160788)


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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/4/

717d39db5ccf29ad5b08504bf2e8f29f SRPMS/cpuspeed-1.2.1-1.23_FC4.src.rpm
9071148d454b4b7579d6462953d5cb00 ppc/cpuspeed-1.2.1-1.23_FC4.ppc.rpm
af4dda3b88850019aaa7ab82b23ea98a ppc/debug/cpuspeed-debuginfo-1.2.1-1.23_FC4.ppc.rpm
8b776cb1a688806fe87f5040fe10034f x86_64/cpuspeed-1.2.1-1.23_FC4.x86_64.rpm
26fbbc5bba02370f97afa1215e591f40 x86_64/debug/cpuspeed-debuginfo-1.2.1-1.23_FC4.x86_64.rpm
c8e0b9b466478693012c6eca2371318a i386/cpuspeed-1.2.1-1.23_FC4.i386.rpm
01374cca7490cd7bb266e98f9186920f i386/debug/cpuspeed-debuginfo-1.2.1-1.23_FC4.i386.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.