bobhumplick

i know this is old but if anybody is planning on using these settings keep some things in mind.  
 
first there is a voltage drop when a cpu is under load.  just like if you run a power tool and the lights dim a bit or if you have  a high powered stereo in your car and the bass hits and the lights dim a bit.  this is natural.  some people claim its built in to protect the cpu but thats not exaclty it.  it just happens to work that way with circuits
 
but mobo makers added in ciruits that would raise the voltage under load.  so by the time you drop some voltage, then the mobo raises it, things even out.  this is called llc.
 
so the mobo opens the "valves" for more power when under load.  the "valves" it opens under load for a 1.35v setting might be the same "valves" it opens when you would have 1.43v set when not under load.  that basically means that if you use 1.35 with a flat llc (the voltage stays the same, on z390 gigabyte boards its turbo) then you are actually tell the board to raise voltage from 1.35 to 1.42v.  that is not good if you have something high set like 1.4 or higher!!!!.  and never use extreme llc.  there isnt much point in it.  
 
if you use a "flat"  llc (voltage doesnt drop but doesnt raise above what you set either) then i wouldnt go above about 1.32.  measuring at the back of the socket on an asrock z370 with an 8700k and later a 9900k, the flat (highest on asrock and turbo on gigabyte) llc setting actually raised the voltage to 1.39 when i set a voltage of 1.31 in the bios.  on that board if you set 1.4v and the flat llc then you would get about 1.48 at least.  THIS IS NOT GOOD!!
 
when you use llc you have to set your voltage much much lower.  you would probalby be better off just not using llc or using the one 1 or 2 levels below "flat"
 
THIS IS ALSO VERY IMPORTANT!!!  the llc level below flat often overclocks BETTER than flat or something insane like extreme llc.  i could run 1.315 at 5.1ghz on my old 8700k with llc set to the one just below flat (on asrock its level 2 with level 1 being highest i think) and it would be stable even though it was drooping down to 1.26 or so.  but if i used flat (level 1, like i thought you were supposed to) i would have to set the voltage to 1.32 and it would not droop much at all..  1.315 would droop to 1.31 or something and still not be stable, even though i just ran the chip stable at 1.26 or so.  i dont know why this is so but its true.  tried on 2 different boards with 2 different chips and was true both times.
 
flat llc should probably not go above 1.32 for daily use.  that might be a bit high.  if you use extreme or anything ABOVE flat then i wouldnt go above 1.28 maybe less than that.  you would be better off going high llc (level 2) or even lower and just setting the voltage to 1.4v at max but better would be soemthing a bit less.
 
people say as long as you can cool these chips then it doesnt matter about the voltage because you will run into heat problems first.  but that is for large aircoolers or aio's under 240mm or so.  large custom loops run at max pump speeds will put you into dangerous territory with voltage without running into thermal throttling.  the guy in this post has either cpu degradation or the board's vrms have degradated.  dont do this.  
 
this guy should have just went for 5.1ghz and a nice low voltage.  maybe 5.2 with flat or below llc and maybe 1.35v max.  avx offsets are your friend and a 5.2ghz clock with an avx offset of 2 so it ran at 5ghz probalby could have been gotten on a 1.32v setting with llc just below flat.  dont do this!!!!!
 
measure your voltage at the back of the socket some time.  1.3v with llc extreme will give you 1.45v at least at the socket even if it reads much less.  like i said 1.315 would read near 1.4v just on flat llc (gigabyte turbo asrock level 1).  if you dont have any vdroop with your settings or if it actually raises voltage (negative droop) then about 1.3 is getting close to max voltage.