My mistake, I did not originally notice that you had a 980x, in that case, scratch that. You may want to try disabling Intel VT. How specifically are you crashing? During POST, stress testing, are you receiving a BSOD, or just hard locking? You may also wish to enable QPI LLC with the jumper on board (even 1.55v VTT did not accomplish stability, but this setting w/ 1.4v managed to.) , as that, coupled with upping PCIe freq + disabling VT got me from 4.2GHz - 4.6GHz stable with this board on an i7 930.