Most of these dedicated servers use off-the-shelf computer motherboards in them. They may have better power supplies though. The clocks in them are usually a dissappointment.
I use a Mac Mini 2009 with SSD and Amarra 4318/19. A Polestar USB cable to my USB interface. Kills everything else that customers have sent me, and they have send 5 servers.
If you do use a music server, consider Aurality or Sonore that support all USB interfaces and have optional USB music streaming outputs. This way, the master clock is not in the server but rather in the USB interface. Then you can select the best USB interface you can afford and get the best result.
Steve N.
Empirical Audio
I use a Mac Mini 2009 with SSD and Amarra 4318/19. A Polestar USB cable to my USB interface. Kills everything else that customers have sent me, and they have send 5 servers.
If you do use a music server, consider Aurality or Sonore that support all USB interfaces and have optional USB music streaming outputs. This way, the master clock is not in the server but rather in the USB interface. Then you can select the best USB interface you can afford and get the best result.
Steve N.
Empirical Audio