How do I know if I have an onboard (integrated) sound card?
To determine if your computer has an integrated or onboard sound card, look at the back of your computer where all of the cords and cables plug into the computer. Find the speaker connector cable, which connects the speakers to the computer, then look where the cable connects to the computer.
If the connection (mini plug) is near where your mouse, keyboard, and USB connections are, it is most likely an integrated sound card in your computer. As shown in the picture above, this computer has an onboard sound card, with the audio ports located above the USB ports. In the case of a tower computer case, like the one shown above, these connections are usually found above or below USB ports.
However, if the audio ports are located in one of the expansion slots, it is a removable sound card and not an onboard sound card.