i5 6600k Voltage drops under heavy stresstest load and causes crash.

ChrisPy96

Commendable
Oct 16, 2016
7
0
1,510
Hey Folks,

I have a little problem with my Overclocking Voltage.

I have the i5 6600k and got to a very nice and stable oc to 4.4 GhZ. on 1.274V.
When i try to get to about 4.5-4.6GhZ. i would need to increase the voltage to 1.3+ the problem now is that when i do that lets say 4.5 GhZ.@ 1.315 V which should work no problem what so ever windows boots and i can load everything but when i go to stress test with RealBench and it goes under load the voltage dips down hard to about 1.272V which is clearly too little for that Freqency i dont get why it dips down so hard my temps are at 30°C at idle and about 45°C
(at 4.4GhZ. with 1.274V the temps are 50°C +/- 5°C at 100% load so i dont think that its thermal throtteling that causes the drop) when i start the stress test then it runs for like 5 seconds the voltage drops and it crashes ofc since there is too little power going to the cpu. My mainboard is the MSI Z170-A PRO Intel Z170 So.1151 Dual Channel DDR4 ATX i think there are some settings in the BIOS that cause the drop but i cant find them

help would be greatly apprechiated!

Cheers
Chris
 
Solution
A high quality PSU is essential for stable voltage supply while overclocking. Overclocking on such a low quality unit is putting your whole PC at risk of damage if it fails.

ChrisPy96

Commendable
Oct 16, 2016
7
0
1,510


I put it on Manual/ Overwrite and im running 600W PSU from Sharkoon (ik is a shitty brand but thats what i currently have)

 
Only a 15 degree rise from idle doesn't sound right anyway, so perhaps you aren't using enough CPU load to draw more voltage, but if it's not set to auto adaptive voltage it shouldn't change at all. Maybe your PSU cant keep up. What model is it? And what stress test are you using?
 

ChrisPy96

Commendable
Oct 16, 2016
7
0
1,510


Well i dont think that the cpu isnt getting enought load since it crashes the whole pc when its on load because the voltage drops and its getting too little power, im using realbench all cores shoot up to 100% so yeah. And how does that makes sense anyway "enough CPU load to draw more voltage" when the Voltage is up to what i set it and then dips down under load ?!?!

Its a Sharkoon WPM 600W

Chris

 
Because voltage is sometimes adaptive and fluctuates with load, depending on settings. That's why "it makes sense anyway...". If you manually offset the voltage, then like I said, it shouldn't change. And the voltage would dip down under load because it couldn't supply sufficient power for the CPU/system needs.

I am not trying to play a game of who knows more, I am trying to help and I'd hope you take it in a similar vein.. I would suggest trying voltage on adaptive, using Intel XTU to monitor for throttling and other stats, and even trying a different PSU if at all possible.
 

ChrisPy96

Commendable
Oct 16, 2016
7
0
1,510


Thats probably true here i think i just be happy with 4.4 and wait until i get another psu

cheers.
 
your voltage drop is normal vdroop. use line load calibrations(LLC) to try to mitigate this. we are not worried about your bios set voltage or your vdroop voltage spike going from 0-100-0%... your actual 100% all core loaded vcore is the actual vcore, the 1.272v you are seeing sounds too low for 4.5ghz+. you are still far away from 1.35v recommend 24/7/365 max vcore for normal conditions. it will likely take 0.04-0.06v extra for each 100mhz you add to your chip. if your power supply is of at least decent quality it shouldn't have any issues running a modest 4.6ghz overclock. for a modest overclock like this you should be using a voltage offset or dynamic/adaptive vcore and let the motherboard do the rest of the work.