The
9420 is based on
Excavator architecture while the
G645 is based on
Sandy Bridge.
Using the multithread performance as a reference, the 9420 gets a score of
28.9 k points while the G645 gets
35.4 k points.
Summarizing, the
G645 is
1.2 times faster than the
9420. To get a proper comparison between both models, take a look to the data shown below.