No worries at all!
Depends on the games you play if you're even hitting the 480hz/fps range as to whether it's worth it. I try to turn off DSC where I can but honestly I'm not sure I notice the difference between them in game.
And because I'm on a 50 series card I don't have any of the black screen issues that I know are a frustration on the 40 series cards. If it was me, I think I'd be happy with either option. 300hz no DSC or 500hz with DSC, two pretty nice options to have!