I7z reports Intel Core i7, i5, i3 CPU information about Turbo Boost, frequencies, multipliers, ... and comes top-like display showing per core the current frequency, temperature and times spent in the C0/C1/C3/C6/C7 states.
This package contains the QT gui for i7z.
Note: For sandybridge and ivybridge, it incorrectly adds C7 state values to the C0 state, so it does report things incorrectly; use the console version as its up to date.