The
i7-6600U is based on
Skylake architecture while the
G645 is based on
Sandy Bridge.
Using the multithread performance as a reference, the i7-6600U gets a score of
48.2 k points while the G645 gets
35.4 k points.
Summarizing, the
i7-6600U is
1.4 times faster than the
G645 . To get a proper comparison between both models, take a look to the data shown below.