It may help somewhat with playback, but you will be hard pressed to hear a significant improvement over the OEM card. Mush of this is likely due to the fact that OEM cards have vasty improved over the past decade to accommodate computer games, MP3s and other audio devices.
------------------ Travlin' Easy
PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)