So, I'm not going to buy this thing, but I've noticed that I can "hear" what my computer is doing through the headphones; evidently the DAC decoupling isn't up to scratch. Given the sheer bulk of capacitance on that PCI card, it actually seems reasonable to me that it could reduce audio frequency shenanigans happening on the power rails? I mean, not worth the money, I seriously doubt it'd do any more than cut the ripple* by a inaudible 10% or so... but it would sort of slightly work to reduce that ripple*, right?
* Where ripple is not the ripple corresponding to the DC-DC converters, but the lower-frequency power rail excursions due to changes in current draw.