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If you have the 5v add-on, can you run the wire to both a powered USB hub and a USB sound card like the Audigy2?
Yes, if your USB devices are not too power hungry (ie WiFi card). The Audigy 2NX takes about 1.8 amps. The P5V can supply about 3 amps. You should have about 1.2 amps for your USB hub + its connected devices.