its normal, by default by using the ai suite your overclock is 800MHz to ur OC of 4200MHz which is equal to what your seeing 0.8GHz to 4.2GHz
the cpu will only jump up to 4.2 when needed and then settle back down to 800 when you dont, very good way to maintain the life of your CPU
if youd like to check what im saying, open the program showing 0.8, then open windows power plan(not sure if windows 8.1 has it but dont see why not lol) and switch it to high performance, you should instantly notice
A. all fans hooked to Optional headers max out (unless u have them mapped thru bios in which case they wont)
B. the program showing 0.8 should now show 4200MHz or 4.2GHz
so IMO best option would be while on high performance update te drive and enable the rapid, then turn the power back to balanced, as long as the drive itself is capable rapid will be on but probly only noticeable when above 1GHZ, not an expert so i may be wrong there, it may just disable it but either way its an ssd so u got atleast double the speed of a mechanical either way lol
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