probably the video card has sound output too. From the other hand any sound card will work, it depends only on your money. And only you know what is "good enough" for you.
check pages like this: https://www.addictivetips.com/buying...ux-sound-card/

Anything that uses USB Audio should be supported out-of-box with linux (e.g. most things marked as 'USB DAC' or 'USB sound card' will work), but may not have all the features advertised for Windows (because a lot of those 'DSP features' are usually proprietary drivers - like Dolby or DTS features).

For an internal card, compatibility is a bit less guranteed - C-Media tends to be the best choice IME, so that means cards from Asus, HT Omega, most Auzentech cards, and the Razer AC-1 and Sondigo Inferno should be fine, but many of those are PCI (not PCI Express). I've also gotten VIA Envy24 to work from a properly ancient M-Audio 2496 (that came out of a PowerPC if you can believe it!), but it only supports stereo via RCA (did I mention 'ancient'?). On PCI Express, the Creative Soundblaster cards that use 'SoundCore 3D' chipset are supported (e.g. Recon3D, Soundblaster Z, ZxR, etc) and work quite well, and some of the Asus cards have PCIe versions as well. Older Creative cards (like Audigy) will probably give you issues, and I'm not sure how other chipsets would handle (e.g. if you go digging you can probably find some Philips or Yamaha cards still floating around on the web, but I have no idea if they'll work, or work well).

I'd probably go with the USB solution because you can get a device fairly cheap and it will give you basic sound. If you need more features then look into a fancier USB device or an internal card, depending on what expansion slots you have available.

Also agreed with pan64 - modern graphics generally can provide audio via HDMI or DisplayPort, if you have a device that can deal with that (if your monitor doesn't have audio outputs to use that, you could get an 'HDMI Audio Extractor' - but for the price you can just as easily get a USB audio device).

Asus Xonar DX, been using this in every build since 2008. Its getting a little old and the windows drivers are questionable, but it works flawlessly in Linux. Can be had on ebay for usually between $25-$50

https://delightlylinux.wordpress.com...dx-sound-card/

I'm also running Buster and at least in my case the sound card is not the issue but the drivers. Produces terrible sound and I cannot find a way to properly configure it. I'm currently looking into changing the distro due to this issue. I have a dual boot with win10 and I would recommend trying Win10/7 on a spare HD to see if the sound quality improves.

For the latest information on supported sound cards and features see the files included with the Linux kernel source code, usually installed in the directory /usr/src/linux/Documentation/sound.

https://www.kernel.org/doc/html/v4.1...io/models.html example

There may be some settings that could affect sound quality. A built in may be usable to some people.