yes mother board drivers are updated
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Your headphones don't even require it as they are low powered (32 Ω only link: EACH G2100 Vibration Function Professional Gaming Headphone | Kotion Each Official Site - Media Center ). For comparison, my E10c and 598SE have impedance of 42 Ω and 50 Ω respectively and my office desktop (Realtek ALC662) can drive them easily.
Realtek ALC887 Onboard audio vs Asus Xonar DG / DGX or any other similar dedicated Sound Card - [Solved] - Components
Dedicated sound card will give you a huge volume boost. My Creative X-Fi (PCI-E card) has such a high volume output that I had to limit max volume in drivers because my Sennheiser HD415 headphones would destroy my eardrums if volume level in Windows would be changed to max by some program (heck even ~30% was unbearable without forced limitation).
As for sound quality, you may get some sweet bass, but I think it's more related to quality headphones and any realistic improvement from soundcard itself would be more available power for output & driving high(er) impedance headphones and quality speakers.
IMO, you should consider buying an external powered amp instead of a pcie sound card if you want higher, but distortion free, sound levels.