[CentOS] intel dual core processors and new kernel packages

I've just got bunch of RHEL4 erratas (looks like U2 is out). Looking at the kernel errata (kernel-2.6.9-22.EL), one of the things in list of new features is "Intel dual core support".

What does this exactly means? Does it mean if I have dual core pentium processor and use older kernel that it will use only one core, and I need newer kernel to use both cores? Or is it only something cosmetical (like updated output for /proc/cpuinfo)? Looking at the bug 167412, it looks more like the later. Anybody outthere running Pentium D or Pentium extreme with 2.6.9-11.EL?

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