Is it OK for GPU to be at 100?

So I have a MSI 290x Lightning and I have noticed my GPU usage is at 100% constant when playing games like Tomb Raider, Sleeping Dogs, Arma 3.

I wanted to know if 100% Usage will degrade the card or not with the temps under control. I've searched online for an answer but people say its good or bad.

Can someone give me a clear answer as this has been bothering me since I've put together my new system.

BTW I have a 4670k @ 4.5GHz if that tells you anything.

EDIT: Its only during gaming. During Idle its 0-1%.

EDIT 2:During the Tomb Raider benchmark I get an average of 84 FPS. So I limited the FPS using MSI Afterburner to 60 and the usage is still at 100%.