Dear member - Adaptec have dealt a stealthy blow to Mac folks, on this one - You want to be VERY aware that Macintosh Adaptec cards are almost always called POWER DOMAIN cards, and using a PC version of an Adaptec Card will almost NEVER work on a Mac! When you buy for MAC, LOOK FOR A POWER DOMAIN CARD, only! The ONLY exception to this is the Adaptec 2906 bare bones SCSI card. This is NOT called a Power Domain card.