Core i3 vs Core 2 Duo - which is more productive?

Question

Intel

It is possible to change your computer, with a Core 2 Duo E6850 stone, to another computer with an i3 stone
. The frequencies of the current processor are 3 MHz, when, like the i3 only, which I was going to take, is 1.9.
Here is the iron itself on which the same percent will be located.
By purchasing this mini pc, will I benefit from the difference between the processors or how much will the performance loss be?

Answer 1

Compare and see at cpuboss.com

Answer 2

there will be a performance loss of 30 percent in gigahertz.