The
G645 is based on
Sandy Bridge architecture while the
3500U is based on
Zen+.
Using the multithread performance as a reference, the G645 gets a score of
35.4 k points while the 3500U gets
149.2 k points.
Summarizing, the
3500U is
4.2 times faster than the
G645 . To get a proper comparison between both models, take a look to the data shown below.