80c is undesirable, but also acceptable, I could say its the borderline between safe and pushing it, ideally you should be aiming to a max of 75C, but 80C for short periods is not something you should go crazy about, yet, if you can, and i'm guessing you're using stock cooler because any decent aftermarket can keep 100% under 80c on my experience at stock values, and considering you're using a non overclockable 7700, extra true...
another easy option would be to undervolt the cpu, something often very easily doable on stock settings to keep things cool but, i dont think your motherboard allows for it even if you had an unlocked processor, someone correct me if im wrong.