Soldato
No, this was with the cpu at 3.95ghz - because even that was black screening with ram at 2400
I think this may be down to your IMC.
My cpu can do 3.9 only if I use memory at less than 3200. I can go 3466 if I use 3.8.
With you using 4 sticks you are putting more strain on your IMC.
Just my thoughts, I have nothing to back this up other than my own CPU.