I have a optiplex 745 sff with qx6800 and gt 1030 I use throttle stop to overclock when I ran it the first time I got to 3.4ghz stable so like a dummy I decided to push to 3.7 it started to get unstable an it crashed windows 10 did a repair thingy and it came back, now when I raise the multiplier it lowers the bus speed so it never goes above 2.9 GHz what's wrong with it