The audio solution of todays motherboards are really good, compared to old days. I have an old SoundBlaster X-Fi and I am not using it. The difference is not big. I can hear a very small noise if I tune up the boxes and don't play any music. The most differences are driver issues with the SoundBlaster, as I am using Linux system. The sound quality is good on both, motherboard and Soundcard. And I am not sure, if there is a working and up to date driver for the Soundcard model you have on current Windows system.
After checking your mainboard, I can say, don't install your old soundcard. Your motherboard have a good audio solution, like mine.
I would use the motherboard audio, unless you experience some problems with it or need really high definition audio. Only then buy a new soundcard. Also I would recommend to buy better speakers, if you are really want high definition audio.
try it, but you may have driver issues with an old sound card. probably not officially suported in newer versions of windows. If you hear any hissing or white noise from your onboard, then the soundcard may be a solution. Onboard sound can often be contaminated by electrical interference from other components where sound cards generally do not.