There's 3 submissions for the i5-6600 which are just stock speeds, the BCLK is at 100MHz and the multiplier is set to 33-39, which is the default.
http://hwbot.org/submission/3147513_belakor_cpu_frequency_core_i5_6600_3600_mhz
http://hwbot.org/submission/3118780_ilias83_cpu_frequency_core_i5_6600_3600_mhz
http://hwbot.org/submission/3021707_hp7909_cpu_frequency_core_i5_6600_3601_mhz
Technically you could say the last one is overclocked, but 100.05MHz BCLK is such a tiny increase from 100MHz that it would make no difference to performance at all.
Is this allowed or should they be removed?