1ghz is surely possible in water, even more like 1050 1060, theres pics on this topic proving the stability.
in LN2 seems that the wall is around 1.2ghz, but i aint sure.
in air, i think even with those superpower-cards like HAWK 1ghz is kinda hard to reach and a bit unsafe.. i don't know, it may be possible with a feel of them but is not guaranteed at all..
i would say that, over 80% of all GTX460s can get stable at @950 with air, but it's just a theory (my theory). Viewing from this point, 950 is not to far from 1ghz so..
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