Is there any benefit to ordering the MAC Pro Raid card for setting up 2 x 500gig SATA drives in a Raid Zero configuration? Or.. Is this accomplished just as well via software in leopard?? Apologies if this is a stupid question - but just wondering if I can save some $ by not having to order the RAID card without giving up anything. I will use a 3rd 1TB drive for Time machine for back up. Thanks for all assistance.