they are not test to be stable. I am currently stressing at 4.5ghz at 1.16. So far highest 77C. The Vring is vcore +0.4 The Northbridge is at 4ghz. LLC extreme. I post more update later. However. To boots to 1.37 with passing benchmark is 1.37vcore. Temperature hits like 87c. it bit too high b/c i only have H2h+ with me. i tried to do 1.44vcore at 5.0 ghz it will crash during benchmark. I think it need like 1.47 to stable. No for me to confirm. However, my goal is 5ghz. I have my custom loop in a few month. I guys know. However i feel this is good batch. The other cpu i got from fry's will not even boot at 1.28vcore @ 4.6. of course Same setting.