overclock Question i7-5820K overlocking issues/doubts

[polister]

Greetings, im new in to overclocking so , i saw that XTU was an easy way to overclock so i wanted to give it a try, i managed to get my 5820k to 3.9~4.1ghz , but i cant go any higher i have Core voltage set to 1.300v and all cores to 4.2ghz but im getting current/EDP limit throttling and i dont know how to deal with that.

i have no thermal throttling/power limit throttling , my package temperatures sit between 50 to 60c° so i wanted to know what do i do to remove that Current/edp limit throttling. thanks
My motherboard is a X99 WIFI G1
EVGA 850B2 power supply

 

Also id like to add that i dont understand why i can keep pushing the multiplier up but the ghz will be always 100ghz below the multiplier, by example:  if i set the multiplier by 43x my cpu will run at 4.2ghz and if i set it to 42x the cpu will run at 4.1ghz , is this normal? or im doing something wrong? all this even if the throttling is "activated"

[polister]

here's a cpu-z screenshot if needed (not overclocked at the time i took this picture)