Your PC may even have an optical out, which I think is better than USB- though some may disagree.
But, big greg is correct, use a USB or Optical cable to the DAC of your choice. The rest is like the usual stereo connections.
As for a sound card, I wouldn't bother. Just use the PC to DAC.
There is a program that doesn't cost much called Fidelizer. It really made a difference for the better.
For a good inexpensive DAC, I would get a Schiit Multibit or Gungnir.
They are available used at a great price, too. Just make sure it is using the current most current updates. But, even if it isn't you can send it in to be upgraded. Great company.
Bob
But, big greg is correct, use a USB or Optical cable to the DAC of your choice. The rest is like the usual stereo connections.
As for a sound card, I wouldn't bother. Just use the PC to DAC.
There is a program that doesn't cost much called Fidelizer. It really made a difference for the better.
For a good inexpensive DAC, I would get a Schiit Multibit or Gungnir.
They are available used at a great price, too. Just make sure it is using the current most current updates. But, even if it isn't you can send it in to be upgraded. Great company.
Bob