You sure you've set all of your options correctly? They all seemed to be binned pretty similarly so it could be something elementary. Can upload some shots of my BIOS if you want and see if they work for you. Same board and RAM from what I can see too.
What cooler you have? The wraith cooler couldn't cut it above 3.85/3.9 for me, was getting in to mid/high 70's and sounded like a 747!
I needed more voltage to pass the RB stress test @ 15 minutes, was crashing at 5 mins on 1.375, needed 1.395 though will see if i can steal some back the other way now.
Pretty sure its the max I can get but I'd like to see yours too just to compare thank you!
I'm using a corsair h100i so temps aren't really an issue. 1.395v is what I am at now with 3.9 though that is solid for me. Passes 8 hours of realbench and 10 hours of AIDA. It seems no matter what I try this chip doesn't want to go 4.0.
Not that 100mhz makes a great deal of difference from the benchmarks I've seen. I think the greater increases will come when the bios's are fully working and *hopefully* we can use 3400 ram