The
3855U is based on
Skylake architecture while the
T2450 is based on
Mobile.
Using the multithread performance as a reference, the 3855U gets a score of
24.6 k points while the T2450 gets
11.4 k points.
Summarizing, the
3855U is
2.2 times faster than the
T2450. To get a proper comparison between both models, take a look to the data shown below.