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Vcore on i72600k @ 4.6Ghz

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February 6, 2012 5:17:12 PM

Hello everyone,
I'm new to the forums and am having trouble when I overclock my CPU to 4.6ghz.

My build is :

Coolermaster 212 evo
i7 2600k
2 4gb corsair vengeance RAM
750W PSU
Asus p8z68 -v lx mobo


I get around 1.4 vcore when I run stress test with CPU clocked at 4.6 ghz when I read that usually it should not exceed 1.35. I am also having difficulty with the offsets for the CPU voltage so right now it's on auto. Also my board does not have the section with DIGI + vrm and the only available options for LLC are auto/enabled/disabled.

Any help is appreciated thanks!

More about : vcore i72600k 6ghz

February 6, 2012 5:38:19 PM

Try disabled for LLC, then try enabled, you should get a more solid Vcore with it disabled and let you find a general voltage you need for your overclock, once you find it you can play more with finding something lower. If you don't need Hyper threading you can disable that and it should allow you to lower the voltage some more.
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February 6, 2012 7:59:46 PM

Thanks omega for the reply, I'll try that when I get home tonight. Do you have any tips for the voltage offset with the +/-? I'm still iffy on how it works.
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February 6, 2012 8:13:17 PM

Try manual voltage first. Let's say 1.3v. Then try upping ur multi starting with 40. Go till it crashes. Then raise voltage a bit, see if it boots. Work ur way up till u get stable boot.
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February 6, 2012 8:16:30 PM

MaxY1234 said:
Thanks omega for the reply, I'll try that when I get home tonight. Do you have any tips for the voltage offset with the +/-? I'm still iffy on how it works.


Personally I used fixed voltage instead of offset. I like to have a stable solid voltage vs one that changes too much on load and idle, not too concerned about power use. I'll probably fiddle more with getting good idle voltage when i have a chance, I was in a rush since i just got my build recently. When i used offset i got uncommon voltages, but at 4.4-4.6 you should be able to use a +0.10 or +0.15 offset. test under load and check voltage though, for me it was really unpredictable unless i had LLC off.
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February 6, 2012 8:39:37 PM

Actually with offset it's more stable under load.
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February 6, 2012 8:45:03 PM

madchemist83 said:
Actually with offset it's more stable under load.


It should be, when i was tweaking with offset i'd get voltage higher than 1.35 under load regardless of my LLC or PL over volt settings. I need to play more with it before i see whats going on. for now i'm stable 24/7 with prime with a fixed voltage under 1.35 so i'm fine with that until this weekend when i have more free time to play :) 
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February 6, 2012 10:09:19 PM

I also wanted to use fixed voltage however my asus p8z68 -v lx motherboard only allows me to change the voltage through offsets.
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February 6, 2012 10:13:32 PM

Have you tried messing with the LLC and pll overvolt settings? they should help you get what you are looking for when testing for stabilty.
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February 6, 2012 10:50:11 PM

I just disabled my LLC and PLL overvolt settings and ran a prime95 test but got BSOD at 1.38v. Is there any other settings that I'm missing?
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February 6, 2012 10:54:20 PM

Put llc on enabled. Does it give u extra option?
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February 6, 2012 10:55:14 PM

Try PLL overvolt off and turn on LLC. if your chip isn't stable at 1.38 at that speed you either have a very picky chip or it's too high a voltage. have you tried disabling hyper threading?
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February 6, 2012 10:58:16 PM

Haha ... Beat u to it
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February 6, 2012 11:00:41 PM

madchemist83 said:
Haha ... Beat u to it


Had work distractions lol
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February 6, 2012 11:07:30 PM

Yeah whatever .. I'm at work too :) 
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February 6, 2012 11:10:49 PM

Ok I just disabled PLL overvolt and enabled LLC. My LLC only has 3 options: auto, enabled, disabled. I thought the point of getting an i7 is to have that feature of hyper threading? Sorry I'm still a novice at CPUs and overclocking. Thanks for the help so far guys. Oh yea my offset is at + 0.085 right now if that information is relevant.
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February 6, 2012 11:13:14 PM

Whoa, after I enabled LLC my vcore shot up to 1.456
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February 6, 2012 11:24:36 PM

MaxY1234 said:
Whoa, after I enabled LLC my vcore shot up to 1.456


keep it enabled and try a lower offset. find the lowest stable offset below 1.35v underload. I was just suggesting disabling HT to test :)  It's easier sometimes to find stable settings with it off, then once you have those stable settings you should be able to do a tweak or two to get it stable with it enabled.

You may be at work also mad, but i'm stuck on a crappy dell optiplex 740 haha
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February 6, 2012 11:25:06 PM

What about these settings: Enhanced Intel SpeedStep Technology, Turbo mode, CPU C1E, CPU C3 Report, CPU C6 report. So far they are all on auto/enabled.
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February 7, 2012 12:12:19 AM

Ok so far I've disabled PPL overvolt, enabled LLC, disabled hyperthreading, and did an offset of - 0.015 and when I run stress test I get vcore 1.35v underload :D . Does that offset look about right? Is every cpu's auto voltage different? And based on that, we offset it either + or - to the vcore that we want underload? Btw, thanks omega and mad for helping me!
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February 7, 2012 12:27:33 AM

Also would you guys recommend I leave hyperthreading on or off? I mainly use the computer for gaming and occasionally programming. Also, do I test if my CPU is stable using OCCT, IntelBurnTest, or Prime95? and for how long? thanks again guys!
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February 7, 2012 12:31:27 AM

No problem. Now try manual voltage and lower it as much as possible. Then switch to appropriate offset
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February 7, 2012 12:32:56 AM

MaxY1234 said:
Also would you guys recommend I leave hyperthreading on or off? I mainly use the computer for gaming and occasionally programming. Also, do I test if my CPU is stable using OCCT, IntelBurnTest, or Prime95? and for how long? thanks again guys!


Hyperthreading has very little use and hurts fps in some games, I saw you mentioned the C1 state, that should be disabled. sorry i tend to forget that and assume everyone knows to turn that off.
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February 7, 2012 1:23:11 AM

I have it on auto. C3 and c6 need to be disabled of you have problems booting
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February 7, 2012 1:43:03 AM

Thanks again mad and omega for the quick responses. Can I ask why C1E needs to be disabled?
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February 7, 2012 1:48:05 AM

Some don't need it disabled but it keeps the cores from going in a sleep state and helps with stability. Shouldn't be an issue but I've always turned it off and I think most OC guides suggest it but haven't looked.
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February 7, 2012 3:36:21 AM

Well, I just ran a prime blend test and in 10min it gave me a rounding error so I increased my vcore from 1.32-1.36v and I am still getting the rounding error. Do I have to increase the voltage more or does it have anything to do with my RAM?
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February 7, 2012 3:45:57 AM

4.6ghz
RAM voltage is at 1.5v
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February 7, 2012 3:56:20 AM

Are you running blend? If so then maybe could be RAM.
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February 7, 2012 4:03:50 AM

Yes. I am running blend. How would I go about fixing this problem if it is a problem with my RAM?
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February 7, 2012 4:10:26 AM

Try running the memory at its rated speed, either enable xmp or punch in what it says for timings and clock. Then test RAM with memtest. If you pass 20 (should take quite a few hours) tests its not your RAM but a bad OC
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February 7, 2012 4:27:15 AM

If that doesn't work try increasing ram voltage a bit.
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February 7, 2012 4:44:34 PM

How much should I increase my RAM voltage by? Right now it is at 1.5v
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February 7, 2012 4:48:51 PM

Don't go over 1.65, but if you can try 1.55
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February 7, 2012 5:10:28 PM

MaxY1234 said:
Well, I just ran a prime blend test and in 10min it gave me a rounding error so I increased my vcore from 1.32-1.36v and I am still getting the rounding error. Do I have to increase the voltage more or does it have anything to do with my RAM?


MaxY1234 said:
4.6ghz
RAM voltage is at 1.5v


MaxY1234 said:
Yes. I am running blend. How would I go about fixing this problem if it is a problem with my RAM?


MaxY1234 said:
I am currently using this 2x of this RAM: http://www.corsair.com/memory-by-product-family/vengean...


MaxY1234 said:
How much should I increase my RAM voltage by? Right now it is at 1.5v


Do not increase the voltage on those 1.5v Corsair modules, they were specifically designed to run 1.5v increasing their voltage will not give stabilization and is probably not the problem anyway. Those memory modules were never bench tested at 46x nor has Corsair claimed any such capability regarding those modules. Drop the memory speed from 1600 to 1333, if that doesn't stabilize drop from 1333 to 1066, if your problem is memory related you'll get further in P95 Blend, otherwise the CPU voltage you're running is either too low or too high.

Intels 1155 socket tested memory range is only 1066 and 1333 anyway, according to Intels website.
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February 7, 2012 5:30:29 PM

When I lower the RAM speed from 1600 to 1333, I get BSOD. What does that mean?
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February 7, 2012 5:43:06 PM

MaxY1234 said:
When I lower the RAM speed from 1600 to 1333, I get BSOD. What does that mean?


What settings do you have it at? timing voltage ect.
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February 7, 2012 6:02:20 PM

mine is perfectly stable at 1600 and 4.7 Ghz.
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February 7, 2012 6:03:55 PM

Hey chemist, did you leave the VCCIO voltage on auto? Omega my timing is at 9-9-9-24-2
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February 7, 2012 6:06:41 PM

My VCCIO voltage says 1.050V auto
DRAM voltage is 1.5V
PCH voltage is 1.050V auto
LLC enabled
CPU spread Spectrum disabled
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February 7, 2012 6:33:59 PM

Take it off XMP and test 1333 and 1066, if it BSOD then i'd go back to what i said earlier, testing with memtest at it's rated specs.
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February 7, 2012 6:48:28 PM

So if u try manual voltage at 1.3 and 4.6gh what happens?
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February 7, 2012 6:51:56 PM

I believe he mentioned not having the option to use fixed voltage. Might require a BIOS update?
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February 7, 2012 7:19:55 PM

When i turned off XMP and disabled c6 and c3 it boots up fine but I still get an error while running prime95. 1.352v-1.36. I'm running mem test now. Will get back to you guys in a couple of hours.
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February 7, 2012 7:22:11 PM

the lx version of the p8z68 board does not have the option to set a manual fixed voltage. I updated my bios to the latest which is 0703.
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February 7, 2012 7:34:55 PM

MaxY1234 said:
When i turned off XMP and disabled c6 and c3 it boots up fine but I still get an error while running prime95. 1.352v-1.36. I'm running mem test now. Will get back to you guys in a couple of hours.


Alright, hope the memtest sheds some light on this. when you stressed the cpu try small instead of blend to avoid doing much ram, that should help leave out the ram as a possible instability.
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