subzero temperatures here in winter. now is summer
used three 920 C0
all want 1.45V for 4GHz w/o HT - air cooled with Thermalright True Black (lapped) + Scythe Ultra Case 2k rpm
temps in linpack (linx) and prime was not more than 75-80C on first hottest core after 3-4 hours testing. Ambient temp (in room) - 23-24C.
in real tasks (gaming etc) temps about 15-20C lower.
temps lower when 100C is ok =) so i don't see any problems.