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undervolt i5 3570k

post #1 of 13
Thread Starter 
Hi guys i have a i53570k and i would like to see if i can keep the clock speeds stock but lower the vcore voltage to get better temps/save a lil power/learn about undervolting. I have looked at a few overclocking guides on ocn but I am still a little confused at what settings exactly I should change. when in bios it wont let me lower the voltages only increase them any help is greatly appreciated.

system

i5 3570k
asus p8z77 v
8 GB ddr3 1600

vcore at stock and idling is 1.04 on load its about 1.22 (according to hwmonitor)
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post #2 of 13
Quote:
Originally Posted by ipv89 View Post

Hi guys i have a i53570k and i would like to see if i can keep the clock speeds stock but lower the vcore voltage to get better temps/save a lil power/learn about undervolting. I have looked at a few overclocking guides on ocn but I am still a little confused at what settings exactly I should change. when in bios it wont let me lower the voltages only increase them any help is greatly appreciated.
system
i5 3570k
asus p8z77 v
8 GB ddr3 1600
vcore at stock and idling is 1.04 on load its about 1.22 (according to hwmonitor)

You need to change the Vcore voltage (CPU voltage) and the PLL voltage. The Vcore you can lower to about 1.15v and the PLL voltage you can lower down to 1.5v.

As for you not being able to lower the Vcore.....I would say to flash the BIOS and then try again.

I hope you realize that undervolting your CPU is only going to put MAYBE 15 bucks in your pocket by the end of the year. Undervolting is a dying trend because so many CPUs are already so power efficient that it is practically useless to try and squeeze any more efficiency out of them.

The three most energy saving things you could do right now is get a SSD, LED screen, and a 80 plus gold or higher PSU.
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post #3 of 13
I agree with Tjj, but want to add that the reason I did it myself was almost solely to keep the heat lower, which in theory will prolong the life of the chip. Can I legitimately back up that claim? No, but I wasn't happy with having it at its stock speed and hitting close to 1.3V for no reason, so I overclocked my 3570k to 4.0GHz and undervolted a -.04 offset. Now it idles as low as 0.81V and 35C and at max load it hits 1.17V and stays at or under 70C, and seems way more stable than it did at 4.1 and 4.2 with less of an undervolt.

Check this out if you haven't already, while I get back to you on the settings I changed. It was super easy, but please keep in mind every chip and system is different, and it can be very easy to fubar your stuff if you don't know what you're doing and go crazy in there.

Edit: Disclaimer: I am in no way responsible for anything bad happening to your system by doing the following! smile.gif
In BIOS Advanced Mode (F7 for me), under Ai Tweaker go to Offset Mode, change sign to - and enter a figure for CPU Offset Voltage. I have this at 0.040 while overclocked to 4.0GHz (see above).
To achieve that light OC, I changed Ai Overclock Tuner from Auto to Manual, which changed the frequency from 103 to 100. Ratio Synchronization Control should be Enabled by default, and I chose 40 as the multiplier.
Pretty simple, but again, read up everything you can find to make yourself feel comfortable with it before pulling the trigger. I don't see any reason a -.040 offset won't work for stock if it works for 4.0. I think -.050 is still pretty conservative for keeping it stable, especially if you don't push it that hard. I guess a bad analogy would be like undervolting and pushing it too hard is like running a car out of gas, it'll stop but it won't blow the engine; whereas too much overclocking (and overvolting) will eventually blow the engine. I don't see any downsides to undervolting if you're keeping it stock.
Edited by gauchotodd - 9/14/12 at 12:05am
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post #4 of 13
I'm surprised you can't actually set a lower Vcore from bios. o.O"

I'm currently undervolted myself, 4.3Ghz @ 1.086v. If you figure out how to lower voltages, just drop the offset and run a short test of prime or IBT after each drop until you hit a point which is unstable. Then push it back up a notch. You could also drop PLL voltage afterwards, although different motherboards seem to have varying affects with it. Most can lower PLL to around 1.6 to 1.7v without much trouble.
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post #5 of 13
Thread Starter 
Quote:
Originally Posted by Tjj226 Angel View Post

You need to change the Vcore voltage (CPU voltage) and the PLL voltage. The Vcore you can lower to about 1.15v and the PLL voltage you can lower down to 1.5v.
As for you not being able to lower the Vcore.....I would say to flash the BIOS and then try again.
I hope you realize that undervolting your CPU is only going to put MAYBE 15 bucks in your pocket by the end of the year. Undervolting is a dying trend because so many CPUs are already so power efficient that it is practically useless to try and squeeze any more efficiency out of them.
The three most energy saving things you could do right now is get a SSD, LED screen, and a 80 plus gold or higher PSU.

Thanks for that i am only doing it to se what effect it has on the temps and saving any money is good wink.gif

Quote:
Originally Posted by gauchotodd View Post

I agree with Tjj, but want to add that the reason I did it myself was almost solely to keep the heat lower, which in theory will prolong the life of the chip. Can I legitimately back up that claim? No, but I wasn't happy with having it at its stock speed and hitting close to 1.3V for no reason, so I overclocked my 3570k to 4.0GHz and undervolted a -.04 offset. Now it idles as low as 0.81V and 35C and at max load it hits 1.17V and stays at or under 70C, and seems way more stable than it did at 4.1 and 4.2 with less of an undervolt.
Check this out if you haven't already, while I get back to you on the settings I changed. It was super easy, but please keep in mind every chip and system is different, and it can be very easy to fubar your stuff if you don't know what you're doing and go crazy in there.
Edit: Disclaimer: I am in no way responsible for anything bad happening to your system by doing the following! smile.gif
In BIOS Advanced Mode (F7 for me), under Ai Tweaker go to Offset Mode, change sign to - and enter a figure for CPU Offset Voltage. I have this at 0.040 while overclocked to 4.0GHz (see above).
To achieve that light OC, I changed Ai Overclock Tuner from Auto to Manual, which changed the frequency from 103 to 100. Ratio Synchronization Control should be Enabled by default, and I chose 40 as the multiplier.
Pretty simple, but again, read up everything you can find to make yourself feel comfortable with it before pulling the trigger. I don't see any reason a -.040 offset won't work for stock if it works for 4.0. I think -.050 is still pretty conservative for keeping it stable, especially if you don't push it that hard. I guess a bad analogy would be like undervolting and pushing it too hard is like running a car out of gas, it'll stop but it won't blow the engine; whereas too much overclocking (and overvolting) will eventually blow the engine. I don't see any downsides to undervolting if you're keeping it stock.

cheers man thanks heaps for that detailed description, im going to give it a go and i will post back with my results +rep

Quote:
Originally Posted by Arkaridge View Post

I'm surprised you can't actually set a lower Vcore from bios. o.O"
I'm currently undervolted myself, 4.3Ghz @ 1.086v. If you figure out how to lower voltages, just drop the offset and run a short test of prime or IBT after each drop until you hit a point which is unstable. Then push it back up a notch. You could also drop PLL voltage afterwards, although different motherboards seem to have varying affects with it. Most can lower PLL to around 1.6 to 1.7v without much trouble.

thanks I managed to get the bios working properly again after a re flash so all is well now biggrin.gif
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post #6 of 13
Thread Starter 
this is the first 5 min test with the offset voltage at 0.040

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post #7 of 13
Thread Starter 
this is the second 5 min test with the offset voltage at 0.050 and the pll is on auto reading 1.8v not to much difference between the two test

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post #8 of 13
Thread Starter 
ill stop posting photos now lol offset is at 0.060 and pll is at 1.7 going to try 0.070 now.
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post #9 of 13
Thread Starter 
I couldn't resist i ended up with pll 1.7 offset voltage 0.060 and overclocked to 4.0Ghz stable prime 95 30 min. package max temp was 80c max core was 76c not to bad with a stock cooler.
Edited by ipv89 - 9/14/12 at 9:03pm
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post #10 of 13
Sounding good =D
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