I5 3570k 4.2ghz voltage?

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Asmari

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I want to oc my cpu to 4.2, i watched many people oc their cpu. But i dont get where to start of my cpu voltage. Should i start at 1.25 the go up? Also how can i tell if my oc is stable?
 
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PapaCrazy

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You can go two ways: Manual V-core mode or offset mode. Manual voltage works at whatever you set it at always. Offset uses automatic BIOS v-core, so when the chip downclocks to idle the v-core can idle as well. Load v-core and frequency will still be normal, but at idle can sink down to as low as 1.6gHz and .90v, which saves alot of power and lifespan. Offset mode uses automatic BIOS v-core but offsets it +/- depending on how you set it. I prefer to use this mode because it puts less stress on the chip when the computer is not active. I OCed my father's 3570k to 4.2gHz using -0.055 offset, and that gave him about 1.26v at load, with idle v-core around .90v.

Whichever way you go, start high on v-core (1.28v in manual mode or something like -0.020 in offset) and slowly work your way down, lowering v-core bit by bit till the computer shows obvious signs it needs more v-core again (BSOD or Prime 95 fail). You test the OC w/ Prime 95 (mathematics calculation software that stresses the chip, available for free). Make sure the program doesn't crash and core temps of the chip don't exceed 75 (some say 70).

I'd estimate you can get that frequency with 1.24-1.27, but you need to experiment to find out how low your chip can go.
 
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Asmari

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I dont quite understand offset mode, unless you can explain it further. But i do understand the other mode. So i should start at 1.25v and keep on lowering the voltage untill i get stable. I dont understand how i get stable though?
 
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PapaCrazy

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I dont quite understand offset mode, unless you can explain it further. But i do understand the other mode. So i should start at 1.25v and keep on lowering the voltage untill i get stable. I dont understand how i get stable though?
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Once you master manual mode research and learn offset mode. Start at 1.28 and lower from there. 1.28 is higher than typically required for 4.2 so its a good starting point. Stability is usually measured by # of hours of operation in Prime95 without crashing. I.e. 1 hour Prime 95 stable, 2 hours Prime 95 stable, 24 hours Prime 95 stable. Alot of people insist on 24 hours of Prime 95, but personally I've always done 1 hour only, proceeded by real world testing - heavy duty gaming for hours on end, just to make sure ;) Stable basically means your computer functions correctly and won't crash on you come a high load.
 
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Asmari

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So if i get stable at 1.25v(which is where i am at atm). Should i lower it? Is my goal to get most stable with the lowest voltage?
 
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PapaCrazy

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So if i get stable at 1.25v(which is where i am at atm). Should i lower it? Is my goal to get most stable with the lowest voltage?
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Yes, voltage/temp are the main contributors to silicon wear and the only two things which make OCing hypothetically more dangerous than stock configs. The lower the v-core, the closer it will be to factory spec, and thus safer for long term use. 1.25 is very good. I'd keep lowering it and see how it does. Couldn't hurt. OCing is all about experimentation. As an Intel engineer once described it: "overclocking is an uncontrolled experiment in better-than-worst-case system operation". Where you decide to end the expirement, how far you decide to push it, and what you expect to gain from it are partially up to you.
 
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Asmari

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Its been an hour at 1.95v. 100% load at 68C. Should i decrease voltage. Or is this stable?
 
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PapaCrazy

PapaCrazy

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Holy living $%it, you mean 1.25v, not 1.95v right? I'm assuming 1.25 because 1.95 would melt the chip and push it waaaay beyond 68C. but yeah, if its doing fine at 1.25 try 1.24 after than for an hour, and keep going as far as your comfort/patience allows. You have a decent 24/7 OC already, but testing the lower v-core limits of the chip can't hurt.

 
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Asmari

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sorry i meant 1.195v
 
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Noahldiamond

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I run an i5 3570k at 4.2 GHz thanks to the unlocked multiplier. My idle temps are around 24C except for core 3 (the hot spot of the die which gets as low as 32C), and overall peak temp of only one core just brushing against 76C using the latest OCCT.

Are my temps ok? I run at 1.28V with an I/O voltage of 1.15. Does this sound healthy to you?
 
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Noahldiamond

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So in other words, all is good on my end? I put a lot of effort into balancing everything. Under normal use at peak load, she reaches 57,65,62,56 for all 4 cores, respectively.

At idle, she gets to 25,25,33,25 for all 4 cores respectively.

- Noah
 
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oneslow50

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Here is my 3570k that i have been running for two years at 4.2 stable as can be. I cant really tell you much about the settings without digging thought the BIOS as im using the O.C. Genie portion of my MSI board to do it.. but it seems that the voltage comes out to 1.144v at full load.

29yi3p1.png
 
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