That tested list is linked from http://www.intel.com/support/motherboards/server/s5520ur/sb/CS-030027.htm
I do see a couple SCSI cards on there, but not the Adaptec card. I would very strongly recommend *not* using a card that isn't on the list. Even if it works once, there is no guarantee it will be stable or reliable.
I agree with Dan... Btw, are you planning to use an external SCSI storage? Because even the ASC-29320LPE card may work with the board there's no way to connect any internal drives to the card.
I was becoming tempted to take the risk, but with my gut feeling and your response I'll do this another way. Thanks.