It will also increase the volume, given it should have a bit more power. The X3 was based on the E7, and the E7 has a lot more power. However, "weak" is a relative term - it's not just the tablet but the headphones and your tolerance for the decibels. What tablet is that and what ear/headphones were you using with it?
Note also that the discussion a few pages ago on the X5's power where a bunch of people basically implied it's a deal-breaker that the X5 can't drive low efficiency orthodynamics or high impedance headphones without an external amp had precisely those in mind.
Edited by ProtegeManiac - 10/26/13 at 8:06am