It looks like a proprietary board that is somewhat wide. There is no extra room beyond the edge of the board for a card, so it all depends on how long that MB is. Measure it and then you'll know what will fit.
I didn't think the board size was needed with a picture of the same size card in the case.
It's made for Dell but it's pretty much a standard micro ATX board.
9.6 x 9.6 inches, standard mATX hole pattern, socket 775 heatsink hole pattern and uses Intel standard front panel connections.
It looks like the 9800GTX fits inside the drive cage.... if it was just a little bit different the GTX 480 power sockets might be slightly blocked. Nothing a little modding wouldn't fix of course. It does look that close though.