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2500k question regarding voltage

post #1 of 8
Thread Starter 
I was curious to see what you guys thought. I'm not new to overclocking, and wanted to test my boards auto overclocking features just to see if it goes past my manual overclock which was a personal goal, and was not high at all. I'm happy at 4.2 but would be good if i could go higher, only reason I don't is i don't get how my voltage is working. On auto my board which is z77x-ud5h. The voltage is set to standard and I use offset, most people use offset to get kinda where they want temp and voltage wise. My voltage on auto seems to be really high I believe its about 1.4. I know auto is not good, but I need to know where my board stood and thought where my voltage should be. That being said, I tried off set , and @ 4.2 ghz can achieve 1.28 volts using an offset of negative 0.010. This seems incorrect to me the way its working, every , and i mean almost every tutorial I have read and video I have watched, shows someone using positive voltage like for example 0.020. I know give or take this can't be answered exactly, but what should I expect in a normal range for voltage @ 4.2 on a sandy bridge 2500k. Mine right now using negative is 1.28 and temps don't go beyond 45. I am using a closed loop cooler master seidon 120 liquid cooler. Say if I used a positive value this would push my voltage way too high for that level of overclock in my opinion. Most people don't really have to go beyond 1.3 for 4.5. I could even settle a little beyond that, but 1.4 that is not good. So to be clear so no one gets confused I only get 1.4 on auto voltage with a multiplier of 42. I use all power settings to keep temps and cooling stable so when i'm not gaming it idles down. i was prime95 10 hours straight no errors. These voltages are read from cpuid. I also was wondering if its more beneficial to overclock by adjusting turbo ratios instead of just multiplier? What i want is a overclock that scales to what I'm doing. if i'm using a games that using 4 cores boost to that speed. When i'm doing nothing idle down. I do want to use offset voltages and do not like the fact I need to go negative because that greatly affects stability on idle states. So what temps and voltages should i look at for a max safe level. I have yet to see very few people use negative offsets. Lastly I only get 1.4 on auto, if i set LLC to standard and not in use basically, on auto it still is high around 1.4, but on offset of 0.010, its 1.28 do the math something doesn't make sense here. Only change is the 42 multiplier in uefi. If at stock 33, voltage is wayyyyyy lower on auto like 1.2, which is insane gap from 33 to 42 and have that high of a voltage jump on auto. Any input into this and help would be greatly appreciated, I have lost sleep over this, and its stressing me out, you could say I have overclocked myself lol.
Edited by Jedson3614 - 4/4/13 at 10:13am
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post #2 of 8
Quote:
Originally Posted by Jedson3614 View Post

I was curious to see what you guys thought. I'm not new to overclocking, and wanted to test my boards auto overclocking features just to see if it goes past my manual overclock which was a personal goal, and was not high at all. I'm happy at 4.2 but would be good if i could go higher, only reason I don't is i don't get how my voltage is working. On auto my board which is z77x-ud5h. The voltage is set to standard and I use offset, most people use offset to get kinda where they want temp and voltage wise. My voltage on auto seems to be really high I believe its about 1.4.

 

When your CPU is overclocked, it is normal for the Auto offset setting to make the voltage way higher than you need it to be. If your CPU were not overclocked, then Auto should result in a reasonable core voltage for stock.

 

 

Quote:
Originally Posted by Jedson3614 View Post

I know auto is not good, but I need to know where my board stood and thought where my voltage should be. That being said, I tried off set , and @ 4.2 ghz can achieve 1.28 volts using an offset of negative 0.010. This seems incorrect to me the way its working, every , and i mean almost every tutorial I have read and video I have watched, shows someone using positive voltage like for example 0.020. I know give or take this can't be answered exactly, but what should I expect in a normal range for voltage @ 4.2 on a sandy bridge 2500k. Mine right now using negative is 1.28 and temps don't go beyond 45. I am using a closed loop cooler master seidon 120 liquid cooler. Say if I used a positive value this would push my voltage way too high for that level of overclock in my opinion. Most people don't really have to go beyond 1.3 for 4.5. I could even settle a little beyond that, but 1.4 that is not good. So to be clear so no one gets confused I only get 1.4 on auto voltage with a multiplier of 42. I use all power settings to keep temps and cooling stable so when i'm not gaming it idles down. i was prime95 10 hours straight no errors. These voltages are read from cpuid.

 

Every CPU is different.

 

Although, even having said that, what LLC setting are you using?

 

 

Quote:
Originally Posted by Jedson3614 View Post

I also was wondering if its more beneficial to overclock by adjusting turbo ratios instead of just multiplier?

 

Can you elaborate? The turbo ratio is the multiplier. It's just another name for it.

 

 

Quote:
Originally Posted by Jedson3614 View Post

What i want is a overclock that scales to what I'm doing. if i'm using a games that using 4 cores boost to that speed. When i'm doing nothing idle down. I do want to use offset voltages and do not like the fact I need to go negative because that greatly affects stability on idle states.

 

The usual culprit for this is setting the LLC too high. It has nothing to do with using a negative offset. I'm speaking from experience here because I haven't needed to use a negative offset yet (but a negative offset is not a bad thing - you just use whatever gets you the voltage that you need). I was using about 75% LLC and I used to have C3 and C6 disabled in order to avoid idle instability. Then I lowered my LLC to 25% and I found that I could enable C3 and C6 without any problems.

 

 

Quote:
Originally Posted by Jedson3614 View Post

So what temps and voltages should i look at for a max safe level.

 

For everyday use, about 1.4V max (as displayed by CPU-Z) and around 85°C to 90°C max in Prime95.

 

 

Quote:
Originally Posted by Jedson3614 View Post

I have yet to see very few people use negative offsets. Lastly I only get 1.4 on auto, if i set LLC to standard and not in use basically, on auto it still is high around 1.4, but on offset of 0.010, its 1.28 do the math something doesn't make sense here. Only change is the 42 multiplier in uefi. If at stock 33, voltage is wayyyyyy lower on auto like 1.2, which is insane gap from 33 to 42 and have that high of a voltage jump on auto. Any input into this and help would be greatly appreciated, I have lost sleep over this, and its stressing me out, you could say I have overclocked myself lol.

 

That's because the Auto setting is going to do whatever it takes to get the voltage to where it wants it to be. It seems to be favoring 1.4V for this multiplier, so that's where it's going to end up regardless of your LLC setting. In other words, Auto is only for stock and nothing else.

 

 

With all due respect, please take the time to separate your posts into digestible paragraphs from now on. Your original post here probably could have been separated into about 6 paragraphs. I admit that it was difficult to read.


Edited by TwoCables - 4/4/13 at 12:34pm
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post #3 of 8
Thread Starter 
Thank you for the response, to answer your questions I'm not using LLC I have it set to standard and for my motherboard that means its not on, other settings include, low , medium, high, and extreme. The multiplier is different that turbo ratios. You can set a static multiplier of 42 and have your CPU run at 4.2 GHz, or idle that is it. What I mean by turbo ratio is you can actually adjust per core for instance 1 core can equal 4.5 GHz, two cores can be 4.4, three,4.3, and four 4.2, and depending on how many cores are used you can use this overclocking method. If you think about it by a green standpoint its not a bad idea to overclock this way if you care about idle settings and boost frequencies.
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post #4 of 8

Which motherboard do you have?

 

Edit: Nevermind. I am confusing this thread with a different one where the member doesn't have their rig filled out like you do.

 

I see now that you have the Gigabyte Z77X-UD5H. I need a few minutes because I'm multi-tasking. :)


Edited by TwoCables - 4/4/13 at 3:47pm
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post #5 of 8
Thread Starter 
Well you tell me if this seems normal or within range of stable, not actually we don't know yet because i'm testing prime 95 right now, but Intel burn test @ 72 deg speed is 4.63 GHz 103 bus speed. V core on cpuid is reading load on prime 95 and Intel burn @ 1.38. Is this voltage way to high for this overclock? O yeah and also prim 95 temps are lower more like 63. this is all on water.
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post #6 of 8
Quote:
Originally Posted by Jedson3614 View Post

Well you tell me if this seems normal or within range of stable, not actually we don't know yet because i'm testing prime 95 right now, but Intel burn test @ 72 deg speed is 4.63 GHz 103 bus speed. V core on cpuid is reading load on prime 95 and Intel burn @ 1.38. Is this voltage way to high for this overclock? O yeah and also prim 95 temps are lower more like 63. this is all on water.

 

Are you using HWMonitor or CPU-Z? CPUID is the developer's name.

 

How did you end up using 103 MHz? It can be better to use 100.0 MHz because then the memory is not overclocked simultaneously.

 

1.38V isn't bad for 4.6 GHz. You could probably get away with maybe 1.35 to 1.36V, but that's not bad.

 

Prime95 is always going to result in lower temps than Intel Burn Test because of the different type of calculations it makes the CPU perform.

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post #7 of 8
Thread Starter 
I wanted to overclock my memory that is why I did that. Also you didn't answer my question about temp limitations is my temp of 72 on burn test to high, I ended up backing down to bclk 103 at 44 multiplier which gave me 4531 MHz at 1.34 volts , medium LLC. I didn't want to go over 70 with Intel burn test and prime is now at high 50's.
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post #8 of 8
Quote:
Originally Posted by Jedson3614 View Post

I wanted to overclock my memory that is why I did that. Also you didn't answer my question about temp limitations is my temp of 72 on burn test to high, I ended up backing down to bclk 103 at 44 multiplier which gave me 4531 MHz at 1.34 volts , medium LLC. I didn't want to go over 70 with Intel burn test and prime is now at high 50's.

 

I didn't know what you were getting at in the first sentence. I apologize.

 

72 is very safe. You don't have to worry until it begins getting into the 90s.

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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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