On board sound on a laptop is almost universally crappy. The 325's deserve better to get the most from them. They are easy to drive, but benefit from a quality DAC and a quality audio chain above and beyond on board sound.
I don't do my serious listening by way of a computer, but even mine have been upgraded about the on board stuff. Others here can give you quality specific advice and there is an entire sub-section of this forum devoted to computer audio.