AMD High Definition Audio - the controller for the audio outputs via HDMI or DisplayPort, on the Radeon card
Via High Definition Audio - the controller for the audio outputs via HDMI or DisplayPort, on the motherboard
Neither of those is your sound card, they're just to control audio from HDMI or DisplayPort outputs, not the speaker jack. For drivers, go to your motherboard manufacturer's website and locate your exact motherboard, so that you can download the drivers for the integrated Audio card on your board, since both of those Audio devices are exclusively HDMI/DisplayPort.
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