See this page for AMD temps:http://www.tomshardware.com/reviews/radeon-hd-7970-benchmark-tahiti-gcn,3104.html
It's hard to find actual temps from all variants, but a bit of googling (say 20 minutes) should suffice.
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Depends alot on your fan settings. Normal gaming with default settings gets me to 75C thereabouts, if i set to 40% fan speed its about 65C. Running a benchmark/msi kombustor gets me to 80C+ easily, or about 77C with 50% fan speed.
OCed/Non-OCed temps isnt much different if you don't up the voltage.