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As reported in bug 1040501, gnome-system-monitor will not show more than 32 CPUs. This is a limitation of libgtop2, which is improved upstream (by allowing up to 1024 CPUs) in two commits:

https://git.gnome.org/browse/libgtop/commit/?id=af7e9cd1b64fea2fff360dcd8b32cf42a197d228
https://git.gnome.org/browse/libgtop/commit/?id=efaaf6eb77e01f1ea002c19a261e4f3ac4788d25

The commits change the ABI of libgtop2, so require that everything depending on libgtop2 be rebuilt. This is currently gnome-system-monitor and gnome-shell-extension-systemMonitor, although the gnome-shell extension would not need to be rebuilt, as it depends on the GObject-Introspection data provided by libgtop2, not on the library directly.

Created attachment 879978 [details]
allow up to 1024 CPUs

sadly, we'll have to move this to 7.1

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0563.html