USB Cable

I use DH Labs but what helped was an intona reclocker https://intona.eu/en/products/7055-c

Get this and 2 usb cables.

Not quite. USB cables do make some difference even with those piece of junk computers. I prefer Supra $55 cable to Wywires $300 cable and they are both much better in every respect than no name in the box cables. Try Supra first, they are sold on ebay, Good streamers are very expensive. USB cables require burn in time too, give it 100 hours or so. Power cord for DAC is also very important and can make a hell of a difference.

Now this comes from someone who hates digital but has to a degree deal with it. I have a modest Burson Preamp/DAC/Headphone amp in the second system.

1s and 0s don't care and no cable you use will objectively change the sound. 

P.T. Barnum was so very prescient. 

What is your outboard DAC?

Audio Research REF CD9