Currently I've just got it at 4Ghz flat (no up-down business), at 1.1v. The ring voltage is the same and since I set the ring ratio to auto, I think the ratio on it is the probably the same (dunno how to tell). My motherboard is the MPower (not Max). While doing Prime95 (version 25.11, build 2 if it matters), and doing the large in-place FFT's torture test, I put my Kraken X40's fans to about 60-70% (which with these Noctuas is still near silent). The temperature after around 50 minutes of testing seems to stabilize around 54-57C. Batch label on box says 3313B372, and Made in Costa Rica. Think I tried to go to 4.2 at this voltage but it bluescreened on me after I started doing anything remotely intensive (stayed okay for a small bit).
Just wanna know where I should aim, thanks.