I think I've got a 4GHz capable chip... Maximum voltage my motherboard could supply is about 1.45V under load from 1.59375V set in the bios.
Anyway, here's 3.6GHz - not test for hours, but it is a good indicator that my settings are close to stable.
I also tested out 3.8GHz, with that maximum my motherboard could supply. Got about 5 minutes in... and something started to smell like it was burning coming from my computer. Everything seems fine, it could have been the little rubber straps attached to the Ultra120x, at least I hope it was those, as the CPU chip was 69-74C under load at 3.8GHz...
By the way I cheated on the ambients because I had the ambient down to 68F from 80F, so I'm not realistically looking at these kind of overclocks until... October. But right now 3.6GHz is definitely looking like my winter overclock. Maybe even more depending on what the ambient room temperature is.
By the way, batch: L723A841
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