Looks like you won the silicon lottery, good for you 
. Whats funny is my batch 2 came with the may firmware but wont overclock past 662 stable, I can go for 668 but sometimes after 24-48 hours one of the boards drops off. I tried the fans at 100% and 750mhz but it crashes after a few min. Mine is stable at 662 55% fan setting. What I did was reverse the fan so that it pulls instead of blows and it dropped the temp by 10c and it runs at 50c.
. Whats funny is my batch 2 came with the may firmware but wont overclock past 662 stable, I can go for 668 but sometimes after 24-48 hours one of the boards drops off. I tried the fans at 100% and 750mhz but it crashes after a few min. Mine is stable at 662 55% fan setting. What I did was reverse the fan so that it pulls instead of blows and it dropped the temp by 10c and it runs at 50c.Damn. I was hoping to identify some pattern. Never won a single lottery in my life... my luck sucks that way. Maybe this is a good omen