Asure of Reactivating

Hello everyone, i use a Windows 8 pro x86 RTM and I want to change my motherboard but i know that i have to reinstall windows and reactivate. the backup/restore activation will not work because its strict in hardware specs so i can't reactivate using that way. so is there any way that i can asure that my product key that i used to activate my pc previously can still be use?