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.
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http/www.bit-tech.net/hardware/motherboards/2014/04/28/asus-z97-motherboards-preview/2
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.