There's not really any way to know until you plug it in. If you were replacing your motherboard with the same type of motherboard, then I would say there is a very good chance of recovering your array. However, if your new motherboard supports RAID, there's a chance it will have a slightly different format than your previous motherboard, which would prevent simply mounting the drives. You can search for a raid recovery tool, or simply trial and error of getting the new motherboard to detect the drives (you'll have to figure out the raid level and stripe size, as well as preventing the motherboard from initializing the disks when you try to create the array in the BIOS).

Either way, it's most likely not going to be simple.