I had 6.7 ghz spi32m chip (3218C207) which died when on MSI Z77A-GD65 mosfet burnt... it was a very good chip
Once I had "Are you fucking kidding me chip" - 4.5 GHz 3930K C2
""Are you fucking kidding me chip" < "Disaster chip" < "RMA chip" < "Tragic shit" < "Shit" < "Average" < "Good" < "Very good" < "Bailando chip" < "Golden chip" < "WR chip"