The
G645 is based on
Sandy Bridge architecture while the
i7-720QM is based on
Nehalem.
Using the multithread performance as a reference, the G645 gets a score of
35.4 k points while the i7-720QM gets
38.8 k points.
Summarizing, the
i7-720QM is
1.1 times faster than the
G645 . To get a proper comparison between both models, take a look to the data shown below.