Pentium G645 vs Xeon E5645

The G645 is based on Sandy Bridge architecture while the E5645 is based on Westmere.

Using the multithread performance as a reference, the G645 gets a score of 35.4 k points while the E5645 gets 77 k points.

Summarizing, the E5645 is 2.2 times faster than the G645 . To get a proper comparison between both models, take a look to the data shown below.