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Amazon.com: PCI-E Express 6 Channel 5.1 CMI8738 Audio Sound Card PC Computer Compatible Ordinary Sound Card Extension Card for Windows : Electronics
Sound card - Wikipedia
Amazon.com: StarTech.com 7.1 Channel Sound Card - PCI Express - 24-bit - 192KHz - SPDIF Digital Optical and 3.5mm Analog Audio (PEXSOUND7CH) : Electronics
4 Channel LP PCI Sound Adapter Card - Our video cards and sound cards enable you to add smooth video performance or high-end audio capability to your PC computer, through a motherboard
PCIe 5.1 Sound Card Surround Audio Output 3.5mm Port Full Height PCI Express | eBay