You will never reach furmark temperatures during gaming sessions (unless you start throttling under furmark like they say happens).
How are you testing Valley? Did you enable AA to the highest (Ultra quality, 8xAA)? For the record, Valley and Heaven use 99% of GPU at those settings.
Your previous cards and their temperatures cannot really be used to compare to a different generation of GPUs. 80C isn't "bad for the GPU" either. It may be annoying, but that is a personal preference/issue and not a problem with the card/temps too high.
How are you testing Valley? Did you enable AA to the highest (Ultra quality, 8xAA)? For the record, Valley and Heaven use 99% of GPU at those settings.
Your previous cards and their temperatures cannot really be used to compare to a different generation of GPUs. 80C isn't "bad for the GPU" either. It may be annoying, but that is a personal preference/issue and not a problem with the card/temps too high.