VTT is memory controller voltage. Guarantee you something related to ram is holding you back. If you're using 4 sticks, take two out just for testing CPU oc
I bet that's its too, I can't find the vtt option anywhere in my bios, using an asus sabertooth z77, is it maybe called something else? *edit* yup, can't find anything that says VTT in my BIOS, tried google and it said it might be called IMC as well. Further investigation gave me nothing, I don't think VTT/IMC is something I am able to change on an Asus mobo...
Hello. I have similar problem. I have I7 3770K + custom WC , MSI Z77 MPOWER and 2x8 AVEXIR MPOWER SERIES 1600Mhz XMP. 4.2 Ghz at 1.150v is max that i can get. Please help me with correct bios settings.