You should be able to phone pallit and ask them for a dongle, they may charge you for it though. The ATI video cards pass sound through the DVI-HDMI dongle, Im pretty certain they do it without needing to connect the card to SPDIF (nvidia cards require this) as well im just looking for a confirmation of that online for you, I know my 3850 did and came with an ATI dongle as well.
EDIT: I know for a fact that the 4850s pass sound and video through DVI-HDMI converters, and since there is no SPDIF connector on the 4850 cards I am 100% certain you dont need to connect to a soundcard for sound passthrough but there is a bit of a messaround getting windows to send sound through your HD device
Remind me to never buy a pallit video card then, my HIS 3850 came with the dongle, a cool screw driver, Crossfire bridge, a whole whack of extra cables, and free games. It was also the cheapest one around when I bought it brand new like a year ago =P
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