Did you check to be sure windows power plan is on balanced?
Having the power plan on maximum will disable it from going back down
I personally am running the rig in my Sig with an adaptive voltage and windows power plan on balanced
Runs from 800MHz when not under load up to my over clock of 4.4-4.5GHz
Also ensure you only have 1 monitoring program installed
Even if there not running at once having more then 1 monitoring program installed is known to cause reading issues, also cpuid every couple builds seems to have issues reporting proper CPU voltages
CoolerMaster HAF 932 Advanced/ Maximus VI Formula/ I7-4770K/Swiftech H320/ Corsair HX850/ G.Skill Trident X (2x8) 16gb 2400MHz/ 2x 840 EVO 120gb(Raid 0)/ WD 1TB HDD (Backup/Storage)/ EVGA GTX 1gb 560 TI/ Asus 12x bluray combo