can you a try a prime95 torture minimal fft = all your cpu cache and half the ram! posts us a screen shot ?
In my post i running higer values and furmark together....
I build that PC for someone else. I still have the 2600K.
I don't have a proof, as I never even did the screenshot for myself.
I can tell you the set up. Open case. I did run P95 for 15-20min. Not a full run I know.
The owner didn't want to run it at all (standing next to me).
CoreTemp high was @ 69Max I think it didn't go to 70 at all if I remember correctly.
Mobo was Sabertooth Z77. He settled on 4.5GHz to keep.
Couldn't make him to go for the water.
I applied all the way to 1.415V or 1.425V + multiplier to 50.