Yup. That's what I mean. You were thinking that your E4 had that problem but it was normal when you switch rig. Ever consider switching the E6 to the E4 rig and vice versa?

Wow! Isn't 63'c for one core high? BTW, noticed that your TCaseMax is 67'c. What is the recommended safe max core temp?

Sorry. What I meant was how close can we get to TCaseMax without increasing the risk of damage to our CPU? What would be a recommended safe range? e.g. if my TCaseMax is 65'c, should I OC until 60'C or can I go higher?

Welcome back irangan! 

Since you're the noctua expert, can I just ask whether the Noctua NH-U12F would be more efficient if I stuck a heat-sink at the flat base?

I mean, there's such a nice empty space at the base!!! 

For those with the noctua (NH-U12F), I've noticed something interesting.

I realized that the steel clips for fan mounting can be mounted higher or lower. As such, you don't have to put your fan at the centre of the heatsink.

I mean, look at your HSF. Because the heatsink is squared while your fan is rounded, your lower outer fins are not in direct air flow.

And another thing, notice that the top most fins are usually at room temperature!! (meaning that they do not need the fan up high)

So what I did was lower the fan as close to the bottom as possible so that more fins are exposed to direct air flow!!!  (the steel clips allow you to do that)

Dunno whether this will affect the cooling power of the HSF but I believe it would. Just that I can't get a constant ambient temperature to test this.......