I've overclocked from 2.13ghz to 2.66ghz and I'm hitting 50C under max load. However with my window open I'm at 55C in Core temp and 42C in speedfan under full load (boinc).
Zalman CNPS9500 with arctic silver.
edit: my picture isn't showing up.
http://bp2.blogger.com/_9yRqYECVfFQ/RYE-ZjHFZ_I/AAAAAAAAAAk/lgPp10jwc8Q/s1600-h/Untitled-2.jpg
it seems like i should be able to overclock to 3.0ghz+ but I don't want to melt my core2duo?