The
i5-450M is based on
Westmere architecture while the
G645 is based on
Sandy Bridge.
Using the multithread performance as a reference, the i5-450M gets a score of
29.1 k points while the G645 gets
35.4 k points.
Summarizing, the
G645 is
1.2 times faster than the
i5-450M. To get a proper comparison between both models, take a look to the data shown below.