If these don't downclock properly, there's no point in downloading.
yes this really sucks, nvidia can't get it working with so many releases.
there is one exception though, the 177.85 downclocks properly, of course, not nearly as good as the ATI counterpart, it is still better than running at max every second, as far as performance concern, 177.85 is just as good as this 177.92( based on the two games i tested: COH and crysis, and 3dmark vantage).