not sure interface type. it's a card on the back of a tower. have to take the side off to get access to it.

Support Information:
Device Type: Sound Card
Manufacturer: Hewlett Packard (HP)
Model: speaker w/amp Riser card 5784510057 rev. A
Interface: Other
Operating System: Windows XP Professional
Age of Device: < 2 years old
FCCID:

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=456&qa5=19&qa7=1500&dp=2&qm0=speaker+w%2Famp+Riser+card+5784510057+rev.+A&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=Hewlett+Packard+%28HP%29+Sound+Card++speaker+w%2 Famp+Riser+card+5784510057+rev.+A+Windows+XP+Profe ssional+) | Research manufacturer Hewlett Packard (HP) (http://members.driverguide.com/index.php?action=getinfo&companyid=456)