If you have a 10 year old system you might have had the electronica crosstalk noises.I like sound cards better than the onboard audio because you don’t get all the electronica cross talk noises and they generally have better amplifiers
A more powerful app is always a benefit especially if he wants to upgrade his headphones in the futureIf you have a 10 year old system you might have had the electronica crosstalk noises.
new motherboards not only have seperate traces and higher quality capacitors just for audio, some of them have seperate pcb space just for audio. those sounds are not a concern anymore, even on very low end boards.
the amp would matter if he used higher power headphones with more impedance. which he does not.
But all "gaming" headsets and even honestly most audiophile headphones will run just fine with no crosstalk or problems with peaking using good on-board which he has. X570 has some pretty good audio on it, especially on the higher end boardsA more powerful app is always a benefit especially if he wants to upgrade his headphones in the future