Do i need to reformat my harddrive(s)

[curtisshim]

so i'm upgrading my motherboard and processor and was wondering if i could only reformat my primary ssd and leave my 500gb HD alone.

 

[manofchalk]

Depends whats on the HDD, but no you don't need too either way.

If its just movies, files and the like, the no there's no need too.
If its chock full of programs, then its possible they wont work with the new OS, reformatting would be an easy way to get a blank slate.