Problem With Game Running Ultra Fast

[LumieX]

So about a year or so ago I upgraded my pc and have a CPU that works at 4700MHz and noticed I wasn't able to play EQ anymore. Basically everything is just insanely fast like GM speed x10. I found out that I had to go into my BIOS and lower the speed to at least 4200MHz and the voltage a similar degree which fixed the problem completely. However when I do that my computer will freeze pretty randomly over the course of the next few hours, sometimes less. Am wondering if anyone knows a better solution to this problem? I've tried a good amount of things like setting affinity and using WinEQ2 etc.