Although I don't have a dual core processor on this particular machine, do YOU have a dual core processor on your new one?. If so, then you will see TWO or four panes in the "CPU History" section when Hyperthreading is enabled and such.
My current Windows XP SP2 PRO machine with an older P4 2.0 processors shows a single "CPU History" display in Task Manager/Performance. One for "CPU Usage" and "CPU History..
Hope this helps.
Why does my old computer just show one screen for CPU Usage but this one shows two screens? Thanks