That was exactly what I was trying to say. The ROG STRIX Z270E GAMING has the following audio features...
ROG SupremeFX 8-Channel High Definition Audio CODEC S1220A
- Dual Headphone Amplifiers
- Impedance sense for front and rear headphone outputs
- Supports : Jack-detection, Multi-streaming, Front Panel Jack-retasking
- High quality 120 dB SNR stereo playback output and 113 dB SNR recording input
- SupremeFX Shielding Technology
- Supports up to 32-Bit/192kHz playback *6
Audio Feature :
- SupremeFX Shielding™ Technology
- Optical S/PDIF out port(s) at back panel
- Dedicated audio PCB layers: Separate layers for left and right channels to guard the quality of the sensitive audio signals
- Premium Japanese-made audio capacitors: Provide warm, natural and immersive sound with exceptional clarity and fidelity
- Sonic Radar III
- Sonic Studio III
Use the onboard sound for a while and if you are not satisfied with it, then you can think of a card.