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High voltage required to overclock my core i7 2600k

post #1 of 18
Thread Starter 
First, here's my config :

Intel Core i7 2600k 3.4G 8M R
MSI Z68A-GD65
Custom water cooling loop with large XSPC radiator using 3x 1300rpm fans

---

I'm now trying to overclock my core i7 and find a safe setting for a real 24/7 setup (i never shutdown my computer or let it go to sleep)

My problem is that no matter what i try, the voltages always looks very high. I don't understand how some people can achieve 1.30v or under with a 4.5ghz overclock (that's my goal for now)

---

So here's the result of my tests so far.. I managed to find a couple of stable settings but my voltages are always high

4ghz with auto voltage = stable
CoreTemp says VID is @ 1.37v

4.1ghz with auto voltage = stable
CoreTemp says VID is @ 1.3761v

4.2ghz with auto voltage = stable
CoreTemp says VID is @ 1.3811v

4.3ghz with auto voltage = stable
CoreTemp says VID is @ 1.3811v

All of the above settings stay at reasonnable temperature even under heavy stress test

---

But to reach 4.5ghz or above, i have to use manual voltage settings

4.5ghz @ 1.385v in BIOS (equals to 1.3911v in CoreTemp)
65°C after only 15 minutes of stress test in Prime 95

4.6ghz @ 1.385v in BIOS (equals to 1.3961v to 1.4011 in CoreTemp)
nearly 70°C after only 15 minutes of stress test in Prime 95


---

Anything above 4.6ghz is very unstable with very high voltage required

if i try 4.7ghz with 1.385v in BIOS, it will equals to 1.40v in CoreTemp and instantly gives me a BSOD while starting Prime95 stress test. I think the maximum i can reach with my CPU is 4.6ghz. I haven't tryed 4.7ghz with over 1.385v in BIOS because it equals to 1.40v in CoreTemp and everything i have read would NOT recommend going over 1.40v

So what should I do ? Any recommendations ?

All those voltages looks very high to me for a 24/7 use. And the voltage difference between 4.5ghz or 4ghz isn't huge...
Edited by anarchoi - 4/26/12 at 5:55pm
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post #2 of 18
The 2600k can start to get hungry after 4GHz.
Mine gets a little peckish.

As long as you are below 80C across all cores under load, you havent hit your voltage/cooling wall yet.

And the max safe voltage for the 2600k is 1.5.
I would say thats well within the normal tolerances from CPU to CPU.
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post #3 of 18
You seem a bit to wary of upping your voltage, I've been sitting at 5 Ghz at 1.46 V 24/7 for 60 days now with an uptime of 19 days I prime95 my computer often to check stability and i never go above 75 c. There are plenty of people who have been running their 25/6/700k's at 1.45+ volts for over a year now and have no issues, don't be too afraid, anything under 80c at prime95/IBT load should be fine for 24/7 use. As long as your temps allow it feel free to push into 1.4v territory!

Good Luck, Nick

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post #4 of 18
Your temps and volts are fine. I'm at 74 on air at 4.5, 1.39 volts. Unstable at 4.6, but I'm not daring enough to push any more volts for fear of higher temps until I get better fans/a better cooler.
post #5 of 18
Thread Starter 
Yes HeadShot is right i'm very worried about my voltage... I've read that intel recommend to not go over 1.38v and a lot of people are saying going over 1.40v can damage your CPU

But i'm also worried about my electricity bill since this computer stays on 24/7... Is there a big difference between 1.30v and 1.40v+ on an electricity bill for a 24/7 usage ?

I don't understand how some people can achieve 4.5ghz under 1.3v ... They are just lucky and got a good chip ?
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post #6 of 18
My electric bill went up a NIL amount, as long as you leave throttling on in Windows Power Management it will pull around 13 watts at 1600 Mhz at Idle which is what my computer sits at when sleeping and at work. I'm not sure where you read that 1.4V could damage your CPU but ANY voltage CAN damage your CPU, AFAIK Intel says that anything over 1.5V has a higher "chance" at damaging your CPU and exponentially increasing chances/speed of degradation and usually the whole reason that running extremely high volts through you CPU can damage it is because extremely high volts cause extremely high temps! As long as you can keep your Prime95 temps below 80 C after 6+ hours you're considered 24/7 stable in my mind as you should NEVER be pushing the CPU to those loads under any normal gaming/folding scenarios!

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post #7 of 18
Quote:
Originally Posted by anarchoi View Post

Yes HeadShot is right i'm very worried about my voltage... I've read that intel recommend to not go over 1.38v and a lot of people are saying going over 1.40v can damage your CPU
But i'm also worried about my electricity bill since this computer stays on 24/7... Is there a big difference between 1.30v and 1.40v+ on an electricity bill for a 24/7 usage ?
I don't understand how some people can achieve 4.5ghz under 1.3v ... They are just lucky and got a good chip ?

Well, max safe voltage is kind of a personal call.
I refuse to go any more than 1.45 because the Spec Max voltage is 1.5, but thats your call.
Any and all discussions of the max safe voltage of SB are suspect at best, and outright speculative crap at worst, but 1.5 is the official ceiling.

Your power bill wont change much, the 2600k isnt too much of a hog.
As long as you arent using Bulldozer, your video card is going to be the hungriest part of the computer.

And yes, getting 4.5 under 1.3 means you have a slightly better than average chip.
Its all luck of the draw.

My 2600k will probably decide to not go any higher than 5Ghz with a good cooler, and I cant get it stable at anything over 4.5 with 4 DIMMS of memory no matter how much I pump into it.
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post #8 of 18
Thread Starter 
So going over 1.40 won't instantly kill my CPU, but will it shorten its lifespan ? Should I worry about that ?

I guess i was just unlucky, according to a post found on another forum:
Quote:
*Less than 5% of CPUs according to a published test by Asus will need more than 1.35V or refuse 4.5Ghz altogether. 80% need LESS than 1.35.


By the way, here is the list of ALL of my BIOS settings in the "overclock setting" section. Do you suggest that i modify something ?
Quote:
cpu base frequency = 10000
adjust cpu ratio = 46
adjust cpu ratio in os = enabled
internal PLL overvoltage = enabled
dram frequency = auto
extreme memory profile XMP = enabled
dram timing mode = auto

spread spectrum = disabled
vdroop control = auto
cpu core voltage = 1.385v
cpu i/o voltage = auto
dram voltage = auto
gpu voltage = auto
system agent voltage SA = auto
cpu PLL voltage = auto
ddr_vref_ca_a = auto
ddr_vref_ca_b = auto
ddr_vref_da_a = auto
ddr_vref_da_b = auto
PCH 1.05 = auto

- CPU Features -
hyper-threading = enabled
active processor cores = all
limit CPUID maximum = disabled
execute disabled bit = enabled
intel virtualization tech = enabled
intel VT-D tech = disabled (greyed out)
power technology = disabled
c1e support = disabled
overspeed protection = disabled
long duration power limit (W) = 200
long duration maintained (ms) = 1
short duration power limit (W) = 250
primary plane turbo power limit (W) = 0
secondary plane turbo power limit (W) = 0
1-core ratio limit = 46
2-core ratio limit = 46
3-core ratio limit = 46
4-core ratio limit = 46

Edited by anarchoi - 4/26/12 at 7:37pm
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post #9 of 18
The diplomatic answer to "is it too much voltage" is that overclocking is inherently operating outside the specifications of your CPU/Motherboard and when you do that you are liable to damage some/all of your hardware in the process. The voltage problem is further compounded by the fact that most if not all motherboards read the voltage either too high or too low.

Your CPU is going to degrade (although at a very slow rate) no matter how you use it; the amount of degradation is affected by several factors such as most importantly current, and temperature. However, there is nothing to say a CPU running at 5.0GHz at 1.4V is going to degrade any faster than one running 4.8@1.39V
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post #10 of 18
Quote:
Originally Posted by anarchoi View Post

---
So here's the result of my tests so far.. I managed to find a couple of stable settings but my voltages are always high
4ghz with auto voltage = stable
CoreTemp says VID is @ 1.37v
4.1ghz with auto voltage = stable
CoreTemp says VID is @ 1.3761v
4.2ghz with auto voltage = stable
CoreTemp says VID is @ 1.3811v
4.3ghz with auto voltage = stable
CoreTemp says VID is @ 1.3811v
All of the above settings stay at reasonnable temperature even under heavy stress test
---
But to reach 4.5ghz or above, i have to use manual voltage settings
4.5ghz @ 1.385v in BIOS (equals to 1.3911v in CoreTemp)
65°C after only 15 minutes of stress test in Prime 95
4.6ghz @ 1.385v in BIOS (equals to 1.3961v to 1.4011 in CoreTemp)
nearly 70°C after only 15 minutes of stress test in Prime 95

Ok first off let me say I don't subscribe to the stable SB club only because my chip sucks but that's what makes it a good comparison for you. Not all of us were born under a lucky star .. I used CPU-z 1.60.1 and RealTemp 3.7:

45 x 100:
LLC = Regular (0%)
all C states enabled
VID = 1.3561
vcore = 1.328 - 1.336
BSOD 101 both idle / stressed in Prime Blend after ~15mins


45 x 100:
LLC = Medium (25%)
all C states enabled
VID = 1.3561
vcore = 1.352 - 1.360
Has now ran over an hour so for this exercise / purpose, it's stable.

I don't use this method to OC so have no idea how to try the middle-ground between those 2 settings (ie: 1.34~) and Manual method would be useless (as the volts won't go down .. another story and this example is just a reference for you anyway). I did leave my PLL down to 1.6v and RAM to XMP but everything else is auto.

In real life I run my chip using offset and only make it bench / game / browsing (usual task) stable - it'll fail Prime which is probably frowned upon here, but I don't fold. Using that I'm happy 4.7Ghz @ 1.40~v. To make that Prime stable I need 1.43v. To make 4.8Ghz Prime stable I need 1.48~v. 4.9Ghz wasn't stable at 1.52v (yes I wanted to kill it at the time lol).

Moral of the story, don't covet your next door neighbours chip .. be happy with what you have.
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logitech G510 Seasonic X-760 Corsair 800D Mionix Castor 
AudioAudio
Creative Sound Blaster X-Fi Titanium HD DT 990 Premium 250Ohm 
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Just a 'puter
(18 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 6700K ASUS Maximus VIII Hero iGPU thanks to Nvidia 970 3.5GB Corsair Vengeance LPX CMK8GX4M2B3200C16 
Hard DriveHard DriveCoolingCooling
Samsung 950 PRO 512GB Crucial M4 256GB RX360 V3 Koolance CPU-380I 
CoolingCoolingOSMonitor
Koolance RP-452X2 Reservoir Koolance PMP-450 12V Variable Speed Pump Windows 10 Pro x64 benq XL2411Z 
KeyboardPowerCaseMouse
logitech G510 Seasonic X-760 Corsair 800D Mionix Castor 
AudioAudio
Creative Sound Blaster X-Fi Titanium HD DT 990 Premium 250Ohm 
  hide details  
Reply
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