Retail, I would feel soooo bad killing Ryan's cpu, glad I decided to try the retail 4770K first, but 2.2 vcore and 2.9 input at -120c resulted in a reboot and constant post code 78 after that. Cache voltage (a.k.a. ring bus, uncore) was at 1.6v for 5000.
I swapped cpu's and out today and see if I can take it a bit easier on this one as retail c0's are not able to handle high voltages it seems.