The Prosody X rev.3 PCIe card takes its power from the host computer expansion bus and has the following power requirements:
Prosody X rev.3 PCIe
20W Max, with a supply ratio of:
+12V DC +/- 5% @ 1.5A
+3.3V DC +/- 5% @ <0.5A
+3.3Vaux +/- 5% @ 0A
Full information can be found in the relevant Prosody X installation guide, see documentation area.