It's just a matter of going into the bios and checking the setting. You could also check the device manager, but that is harder to interpret.
In device manager:
If it is in IDE mode, the IDE device listings will list 2 or 3 standard IDE controllers
If it is in AHCI mode, the IDE device listings will list an Intel SATA AHCI Controller
If it is in RAID mode, there will be a listing under Storage Controllers, separate from the IDE controllers, naming an Intel RAID controller
Just make sure the new board is in the same mode, if it can. Some Intel chipsets don't have the RAID capability.