mark9442606 :
I have my r7 clocked at 4ghz 1.43125 and it is on air with a cooler master hyper 212evo with 3 fans including exhaust fan right beside it. I know 70c wont break it but how much will it shorten its life span? also it scores 1715 and that seems bad for 4ghz..to me anyways
To answer your question: yes, 70C will shorten it's life if experiencing that in continuous operation. I tend to think you're seeing that temp during stress tests and benchmarking, though. During normal use, even in highly threaded CPU intensive games, it shouldn't peak that high for a long enough duration to be a serious concern. It would probably be crash-happy if it did.
Even if it did see that temp in continuous operation you'll probably lose interest in the platform before it dies.