just chiming in to say agree with keropi but would say it may not only be OEM's but just compatibility issues with earlier motheboards' PnP implementation? I'm no expert but my experience has been my Orpheus was not detected on my Soyo SY-025K that is a very good mobo and never had any issue with anything else I've thrown at it, including many different soundcards, but it would just not detect the Orpheus. Keropi helped and JazeFox (from UNISOUND) a whole lot as well, and we ended up discovering it was related to ISA timings as the card started being detected as soon as I set ISA timing to CLKIN/5 or smaller, but that created other issues with garbled sound and stuff.
I've tested the Orpheus on 5 other motherboards and all of them detected it flawlessly. So I've since then swapped my SY-025K (which was a bit of a bummer, such a hassle-free and overall great mobo, that problem aside) to another (luckily, also very good) QDI V4P895P3 and I've been enjoying the Orpheus very much since then. It's a wonderful card!