SQ?, You mean Sound Quality ?, Because if you do then the asnwer is. Yes, A Lot better. The bass will be tighter, the mids, highs will be crisper. Games will play better because of EAX. Your speakers cant come to life without a dedicated soundcard.
Infact if you bought an SoundBlaster Audigy 2ZS of SoundBlaster X-Fi ExtremeMusic, well you would be amazed
. Your jaw would drop to the floor and never return because of the vast improvement, and you will be shoving your ears infront of the subwoofer trying to pick out dodgy sounds, but truth is, you will never find one
. Even if you grab yourself a SoundBlaster Live 24Bit the improvement will still be very noticeable and highly worth it.
I can highly reccomend any of the soundblaster series, X-Fi being the Best, Audigy series being very good, Live being very cheep, and still brings a smile to your face.
Out of personal preferance i would say choose a card in the X-Fi series, especially the ExtremeMusic. Even the XtremeMusic hardly breaks the bank
. But if you just want a good improvement (I actually mean very good) Then get the SB Live Card.