Make sure you do sufficient stress test too. Prime95 - blend tests for example. From my testing, sometimes BSOD comes within minutes, sometimes within 1 hr. sometimes calculation error, but no bsod
The tutorial i read up uses approx
4.5GHz @ 1.24v ~ 1.27v
4.7Ghz - 4.9GHz @ 1.35v

So, 5Ghz should need 1.4v+

Not sure about that. But ASUS AI Tuner settings are temporary. The only way was to change settings in BIOS.
Software = test different voltages quick without rebooting. BIOS = changed settings here stays
Might be same for ASRock.

i know ppl dun recommend auto but auto do very accurate vcore for me
1.424v or 1.417, when i go below this, straight freeze of bsod

edit: i mean dun recommend auto sorry typo error

sorry i mean in UEFI

u find in cpu overclocking section, select load setting and choose 4.8ghz, then find vcore set auto, got a thing level 1,2,3,4,5, select level 5, PLL select lowest

you cannot set 5.0ghz in asrock uefi
btw whats your cooling? you look like duno overclocking will increase production of heat

h80 corsair...my temp is 42 idle ...so weird...

i think u better stay at 4.8ghz
go uefi and set to 4.8ghz voltage to auto and go to axtu and set to 5.0ghz

= ='' you mean sometime it goes 1XXXmhz? its intel speedstep technology, if u wan see 4.8ghz stress ur proc with prime95

   
the core no need to run at 4.8ghz when its idle, its not u wan to let it stay at 4.8ghz or not, its not nessery

When you overclock always do in small incremental and need a lot of patience. It may take days to reach the highest Ghz with stability which they run the Prime95 for 24 hrs. And doesn't mean that 1 system specification will have the same overclock with the another system with the same specs.

Stable with how many hours of stress and max temp?

Stable means no BSOD, auto restart, errors when put under at least 1 hr of stress test... go get prime95, do blend tests. Be aware of your temperatures.

Normal la, under stress will be hot. What cooler are you using? OC must make sure stable under stress and temperatures stay within 70c/80c (up to you to decide the upper limit)

To check max temperature and to see if stable when OCed. Length of test is up to you. I would say 30-60 or 90 minutes.
OC may be stable under light load, but when full load, it might become unstable. Prime95 tests the full load part.

Yes, and it can be quite a big amount when you exceed ~4.3Ghz

This thread was about OCing. At least you know the temperatures of Non OC then can compare to with when OCed

You sure 3.4Ghz 70c using H80? I get ~66c using TX3 2600k @ 4.3Ghz.

Ambient temperature was 28c got ~66c prime95. Ambient 31c got ~71c prime95.
TX3 standard single fan full speed. Thermalfusion400 thermal paste

Ambient temperature was room temperature. Readings taken using thermometer in room.

Did you remove completely old thermal paste on both surface of CPU and cooler? Tuniq Tx-2 should able do the job.. What casing and airflow setup that you use?