I can't speak to PC options but you may want to consider a DDC to clean up the output before passing to your DAC. I use a MacMini with Roon and I previously got similar SQ with optical and USB outs, but optical was more reliable. I've since added a DDC passing USB to i2s output with great results.
Best Audiophile desktop for under $2500?
My DELL Precision T7610 is crapping out on me. I was very happy with it and the synergy with my Modwright OPPO205 and sysytem was great. It has trouble playing WASAPI 768khz on the latest JRiver and ROON. Any suggestions on a store or used bought desktop that is Audiophile worthy? I work everyday and dont have time to build one. Thanks in advance!