Motherboard's soundcard VS Dedicated soundcard

[non-serviam]

I have the Sony MDR-1A headset and the Logitech Z-5500 speakers (I might upgrade them) and I am building a new PC in which I will use the Asus ROG Rampage V Edition 10, that has the below audio:

ROG SupremeFX 8-Channel High Definition Audio CODEC
- Supports : Jack-detection, Multi-streaming, Front Panel Jack-retasking
Audio Feature :
- SupremeFX Shielding™ Technology
- DTS Connect
- Optical S/PDIF out port(s) at back panel
- Audio amplifier: Provides the highest-quality sound for headphone and speakers
- Premium Japanese-made audio capacitors: Provide warm, natural and immersive sound with exceptional clarity and fidelity
- Sonic Studio II
- Sonic Radar II

Will I understand any difference if I put a dedicated soundcard like the Asus Essence STX II (if you have any better suggestion please feel free to post it, but keep in mind that I work on Linux mostly)?

 

[maymod]

Well what i find is the only difference is when you have a set up of 5.1 to 7.1 they will differ in sound the quality on most 3.1 systems are not that noticeable..
So if you setup surround and a dedicated sub woofer than a sound card you will need. If you got the standard speakers on a 3.1 or a 5.1 the sound significantly does not get better with a sound card probably a little clearer and slight noticeable effects on your surround.. Motherboard sound cards dont do Dolby Atmos and higher prologic 2. In any case it also depends on what materials you play such as music or videos and some of them have audio support that may not play on regular on board cards.
Some on board sound cards can be very good in your case its average with the lower/mid end setup.
All in all i would stick to your mother board on board card with the speakers you have.
I dont have this problem i use my amplifier via HDMI.

 

[non-serviam]

Well what i find is the only difference is when you have a set up of 5.1 to 7.1 they will differ in sound the quality on most 3.1 systems are not that noticeable..
So if you setup surround and a dedicated sub woofer than a sound card you will need. If you got the standard speakers on a 3.1 or a 5.1 the sound significantly does not get better with a sound card probably a little clearer and slight noticeable effects on your surround.. Motherboard sound cards dont do Dolby Atmos and higher prologic 2. In any case it also depends on what materials you play such as music or videos and some of them have audio support that may not play on regular on board cards.
Some on board sound cards can be very good in your case its average with the lower/mid end setup.
All in all i would stick to your mother board on board card with the speakers you have.
I dont have this problem i use my amplifier via HDMI.

First of all thank you for your answer, even though its syntax makes a bit hard to understand what you are saying.
Secondly, the sound system that I currently have is indeed 5.1 with a dedicated subwoofer and my headphones are of good quality. I did not ask if there would be any difference between a dedicated soundcard and an onboard one. I asked for my particular setup, if I will understand a difference in sound quality, taking in account that I might possible upgrade my speakers to a better set.