Do i need new sound card

well i plan on buying this stereo for my comp

now all i hav is a realtek sound card that is in the mobo for good surround sound in games should i buy a new sound card

My mobo is an ECS A780VM-M2
and is supposed to have all this stuff (below)Â but will i get surround sound in most importantly games but also will Windows media player use all speakers

8 Channel High Definition Audio


8-channel HD Audio CODEC delivering advanced multi-channel audio and
bringing you the experience of home theater-quality sound

it will work fine with your motherboard, that is to say it will all plug in, however it may not have the greatest quality because your sound card is not that wonderful. definitely listenable though, no doubt about it.