A10 7850k overclocking high voltage

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machetazos

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Sep 3, 2014
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Hello everyone!
I have overclocked the above mentioned apu in the bios step by step(increase multiplier, do an occt test until unstable, raise voltage and repeat). I was looking at the overclock giude somewhere else and they managed to get up to 4.2 GHz with vcore of 1.25. when i did it, i could get it stable barely at 4.1 GHz with vcore of 1.356V. This seems very high to me, and i don't know why there's such a difference, and i'm affraid to go higher because of the temps, which now are around 15 degrees celsius in thermal margin. Any help would be appreciated.

my specs:
gigabyte g1 sniper a88x
amd a10 7850k black edition
zalman cnps 7500 led cooler
aerocool strike x 800w 80+silver psu
samsung 840 evo 120gb ssd
gigabyte radeon r9 270x
crucial ballistix 2x4gb ddr3 1600 ram
 
Solution
M
Oh it may be Vdroop.. YOu know when a cpu is stressed the motherboard maybe reduces the voltage provided to it.
Check the voltages with CPU-Z if under stress voltage is lowered.. If it does check for LLC load line calibration settings on your mobo and set them to medium to keep up the voltage even on load.
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masterdam17

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Mar 1, 2013
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OK no hardware is the same. What do i mean with that?
The overclock i get for a card , cpu or memory might not work for your cpu, card or memory.
Each hardware has its own limitations, theres no assurance you get when overclocking. No one can predict where your card may reach with voltage and what temperature output you will get because no one knows :S
THats the risk we take, the overclockers. You might get a great chip and be able to overclock much higher than average or you can get a bad chip and cant go over the avg.
SO my recomendations, dont stress the card.. If you get decent temperatures its ok to go ahead and rise up v and speed. But if you get high temps ,reduce them Volts till you get acceptable ones and keep that config.
It may not show artifacts or shutdown.. but at high temps cards get deteriorated quicker.
 
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machetazos

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Sep 3, 2014
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yes, i know that no 2 systems are the same and will operate the same. it just seems strange to me, that there so much difference. the guide that i was looking had an asrock motherboard, but still the voltage numbers are so much different. i also looked in a thread here on this forum. the guy had same apu and same mobo, and got a 4.4 GHz with only +0,060V(1,308).
I couldn't get near even 4.1GHz with any lower than 1.356V. and same applies to many other oc guides i've seen for this particular apu and mobo. Something seems strange but i can't figure out what. also when i was trying 4.2Ghz i couldn't get it stable with vcore at 1.42V and i didn't go higher because of the temperatures. At that vcore others were geting an oc in the 4.4-4.5 range.

 
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masterdam17

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Mar 1, 2013
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Oh it may be Vdroop.. YOu know when a cpu is stressed the motherboard maybe reduces the voltage provided to it.
Check the voltages with CPU-Z if under stress voltage is lowered.. If it does check for LLC load line calibration settings on your mobo and set them to medium to keep up the voltage even on load.
 
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Solution
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machetazos

Honorable
Sep 3, 2014
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I noticed the voltage dropped a littlebit from time to time on stress tests. i changed the mode to medium as you said, just did a stress test with occt and it froze after a minute or so. before it passed all the tests i threw at it, but i noticed earlier that it crashed playing battlefield 3 after about 2 minutes. i tried 3 times and it always crashed. will do some more testing and adjusting the voltage to see if i can make it stable.
 
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machetazos

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Sep 3, 2014
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ok, with llc set to medium and vcore set to 1.356V it seems stable. It passed all the tests(prime95, occt, ibt and amd stability test) as well as game tests(cod ghosts and bf3).
but i still couldn't get it stable with lower vcore. now, when i run tests it varies between 1.308 and 1.344(it is set at 1.356). At 4.2GHz however i couldn't get it stable even with raising vcore an aditional 0.060V. At this point i gave up, because the temperatures were getting high, and went back to 4.1 @1.356V. As i said it is stable but the voltages are still way higher according to other overclocks and guides i've seen around. i guess i'll do some more research to what could be the cause for this, otherwise i'll just have to stay at 4.1.
Thank you for your help!
 
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machetazos

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Sep 3, 2014
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i just found out something interesting in amd overdrive. there, vcore is set at 1.2625V, and it does not exceed that even during stress. if that value were true(although in the bios it's set at 1.356 and cpu-z shows the same) that would explain everything. i'm gonna have to take a look at that. what do you think?
 
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