As if 70 degrees if fine.
Anything imo above 60 degrees usually ruins the piece of hardware.
If you have overclocks on then try and lower them or take them off completely to see if they are the cause of the high temperature.
Also look here at my problem that was solved due to some cleaning. You never no, it could just be a dust clog in your fans or maybe a cooler
<---- That was my problem (click)