A new update is available for Fedora Core - Fedora Core 4 Update: x86info-1.15-1.11. Here the announcement:

Fedora Update Notification
FEDORA-2005-922
2005-09-23
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Product : Fedora Core 4
Name : x86info
Version : 1.15
Release : 1.11
Summary : x86 processor information tool.
Description :
x86info displays diagnostic information about x86 CPU's, such
as cache configuration and supported features.

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Update Information:

Upstream update, which recognises a whole bunch of extra CPUs.

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* Fri Sep 23 2005 Dave Jones <davej@redhat.com>
- Update to 1.15


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

f0afda399a704300fa51ab96c3f956f5 SRPMS/x86info-1.15-1.11.src.rpm
792243801da252b01b1a4bf4dc1bd863 x86_64/x86info-1.15-1.11.x86_64.rpm
9c28aaf9b2d6253915997f2af83896a5 x86_64/debug/x86info-debuginfo-1.15-1.11.x86_64.rpm
e71a0324e1154bf4ec21fac32b70a405 i386/x86info-1.15-1.11.i386.rpm
7c99c5d1f69371018f574df54e29edb1 i386/debug/x86info-debuginfo-1.15-1.11.i386.rpm

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