Thank you for the info. Question lang so eventhough hindi ganun kaganda yung bibilhin kung sound card as long as top-of-the-line ang video card card ko I can still enjoy 5.1 audio?
Bro, a 5.1 ch Creative sound card is sooooo much cheaper compared to an HD 3xxxx or 8800GTS video card. If you can spend hundreds of dollars on the video card, why would you not spend $50-$75 on a reasonably good 5.1 ch sound card? My point is, it's generally better (and more convenient connection wise) to rely on your sound card for 5.1 ch audio, than to use the graphics card for both video and audio. In case of trouble, it's also easier to isolate the problem.
For top of the line video cards, make sure you have sufficient and reliable power supply unit, that your mobo can actually support it and that you'd have sufficient space in your PC case to insert one (those hi-end cards are not only fat, they're also looong).