Apparently there are two versions of the RSSC. I don't know exactly what the differences are, but below, are the full specs for version 1 from dell.com. This the version I have. I left an email to zalman support to get some explanation of the differences. I also have the zalman 5.1 channel headphone amplifier. Their products work great and are affordable. I would like to see more audio products from them. There are originally in the cooling fan business and recently exanded to audio.
Tech Specs
General
Device Type Sound card
Enclosure Type External
Interface Type USB
Width 3.1 in
Depth 4.3 in
Height 0.6 in
Audio Output
Sound Output Mode 5.1 channel surround
DAC Data Width 24-bit
Sample Rate 96 kHz (max)
Features Volume control
Expansion / Connectivity
Interfaces 1 x USB ¦ 1 x audio - line-out (rear) - mini-phone stereo 3.5 mm ¦ 1 x audio - line-out - mini-phone stereo 3.5 mm ¦ 1 x audio - line-out (center/subwoofer) - mini-phone stereo 3.5 mm ¦ 1 x audio
Miscellaneous
Cables Included 1 x USB cable
Compliant Standards Plug and Play
Software / System Requirements
Software Drivers & Utilities
OS Required Microsoft Windows 98SE/2000/ME/XP
System Requirements Details Windows 98SE/2000/ME/XP - Pentium III - 600 MHz - RAM 256 MB