Welcome to the ROG forum.
I get the Clock_Watchdog_Timeout crash when my overclock isn't stable, do you get an overclocking failed message after you get this?
The freezing is likely to do with the ram, in the bios on the extreme tweaker tab try raising the Dram voltage to 1.25v - 1.30v does this stop the freezing ?
Wow 1.5v on auto in the bios is high for default settings, 1.20v - 1.25v should be enough for a stock 6700k.
You want all cores and hyper threading enabled.
Try rolling back to bios 1902 and see if this has an effect on voltage and stability.
My friend it's looking like you may have a bad cpu as it should run on default settings with all cores and hyperthreading enabled without problems and have much lower voltage readings in the bios.
I've seen a few people having trouble with the corsair vengeance lpx ram and raising the voltage most of the time does help, you can try the Dram voltage at 1.30v and the cpu core voltage at 1.30v.
let us know if bios 1902 helps.
If none of this helps, contact Intel and tell them what's happening I'd be interested to know what they say and/or if they have you RMA your cpu.
Yeah contact the store you got it from they should take care of you.
Please come back and give us an update when you get your new cpu.