Using computer USB with DACs has been a dilemma for audiophiles. For many years, USB was thought to sound worse than SPDIF or AES from a good transport. I went down this rabbit hole myself years ago: https://www.changstar.com/www.changstar.com/index.php/topic,925.0.html. Other members have gone down similar rabbit holes with excessively long chains such as Mutec/Dante/Whatever. Done correctly by someone who is a good audiophile chef, the results can be superb. However, there is no question that these approaches are excessive and actually kind of dumb, in that they increase our chances of dying as bitter lonely old men. One thing which I don't people really understood is that USB is a two way street. There's a lot of obsession of what is on the receiving end, be it XMOS, Cmedia, Unison, Ti, longSchlong and other boutique brands. However, many folks seem to ignore what's on the transmitting end. I've all all sorts of results with different sources. My old Sony VAIO laptop had a dedicated USB port which sounded better than the other ports which it was isolated from. The USB on cheap Dell laptops I had all sounded like ass compared to my gaming tower PCs. Heck, even different operating systems sounded different, with Linux and MacOS sounding better than Windows 7. (Windows 10 actually sounds pretty good). There could be reasons for this with respect to how the operating systems send or rearrange USB packets. Anyway, this came to mind because @rlow mentioned that his boutique Sotm AIO source sounded better using Unison than SPDIF/AES from pi2AES. The latter being a standard among many members, mainly for it's easy of use for streaming (once properly set up). @rlow's post comparing three different source transports is here: https://www.superbestaudiofriends.o...sports-shootout-with-unison-usb-and-aes.8810/ So this got me thinking. I know there are many fans of the sound of Unison USB on the Schiit DACs here. However, I've always taken a liking to a good SPDIF/AES source to the Yggdrasil DAC over any USB including Unison. Unison to my ears has been too tubey, too smooth, slightly glossing over stuff. No doubt it's better than the older Gen 5 from Schiit, but perhaps too much into the other direction? This is when I realized that I picked up this PCI USB card years ago intending to try it out. I forgot about it until recently when I found in a box of old that I had just unpacked. This card is still available from Amazon, although the brand of it has changed. https://www.amazon.com/BEYIMEI-Expansion-Connector-Suitable-Linux（2X/dp/B08DFBCSH3/ The chipset is Renesas: So I was curious if this would sound better than the USB 3.0 and 3.1 outputs from the back of my motherboard. That if I would have a similar experience to @rlow in having something better sounding than the piAES AES output, that is being able to reach the fuller potential of Unison.