Looks like it's stable with 4.4 and 1.2v. If I want to get to 4.5, I have to move mine up to at least 1.24 and I haven't done as much stability testing with it yet. Anything lower blue screens when I start playing with Prime. The H100 keeps the temps after an hour of IBT at a max of 75C for two of the cores. I've got it in a push/pull configuration in the top of my Arc Midi with the filter foam left on the honeycomb top. Preliminary playing with 4.5 moves the temperatures into the low 80s. Not sure how much hotter I want to let it get as a regular OC. 4.4 may be the easy spot for my chip.
This is using the stock TIM on the H100. I've got some IC Diamond but I don't know if I'll open it back up to apply it. Not positive how much effect it would have and I know the IC diamond is abrasive and I'm not sure if it would actually damage it over time if I had to RMA the H100 anytime soon. Also, I had to get another H100 because my first one suffered from the grinding noise. This second one still has a little pump sound, not sure how loud pumps should be as this is my first ever inclusion of any sort of liquid cooling, but it isn't noticeable when not stress testing with the case closed up. The first one sounded like someone was barely sticking a rubber eraser tip in a fan blade.
No girl will ever think you're cool because you have a neat or fast computer. So don't waste money or time trying to doll it up. ^_^
.......Also, I had to get another H100 because my first one suffered from the grinding noise. This second one still has a little pump sound, not sure how loud pumps should be as this is my first ever inclusion of any sort of liquid cooling, but it isn't noticeable when not stress testing with the case closed up. The first one sounded like someone was barely sticking a rubber eraser tip in a fan blade.