I have a video card and a sound card. My Monitor has a audio jack which just forwards the audio signal from the HDMI cable. But the cable is connected to my video card and for sound, only the onboard chip is used.
Is there a way to use the audio signal from my actual sound card with the HDMI cable connected to my video card?
While some graphics cards have an internal S/PDIF port to allow passing audio through to HDMI, newer graphics cards, such as your GTX 470, have done away with it and instead route audio through the PCI-e bus.
Since we're talking about purely digital sound at this point, the graphics card should be able to produce the same quality sound as your sound card. The quality of the audio is largely determined by the DAC your audio goes through somewhere along the line. Here's a very informative thread about the subject: http://hardforum.com/showthread.php?t=1648732
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