wow, awesome chip.
LOl, I dont know, if to the Czech republic are binned bad chips, but my chips 5960x:
2x L418C676
first one
air (Noctua NHD14)
4300 MHz 1.32V stable
4400 MHz 1.375V Cinebench stable
LN2: max 5 GHz Cinebenchs, CB -125
second chip:
seems a bit better, testing from yesterday
Cinebenchs 4350 MHz 1.25V