4770K Overclock Vcore question

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Ze-goldfish

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Dec 19, 2013
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I am currently trying to make my first overclock and am confused of what minimum Vcore should be :p

So far I have run at 4.4GHz on 1.190 Vcore for 2 hours without any BSOD.

Is it really possible, that I can run this low Vcore on 4.4GHz. All others I have seen on the net say at least between 1.20 - 1.25 Vcore to be stable.
 
Solution
bdiddytampa
Absolutely it is possible, every chip is different, so one chip's stable OC can be very different from another. If you are stress testing stable, then you got a good chip :) How are your temps?
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Ze-goldfish

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Do you think I would be capable of running at maybe 1.8 Vcore? BTW how fast would I see If I have come to the minumum? If i go lower Vcore than It is capable of would it BSOD instantly or how fast would i notice? :)

As I stated in the beginning it is my first try :p
 
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bdiddytampa

bdiddytampa

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You can always try to go lower, you aren't going to damage anything. As for how fast it might become unstable isn't something I can reliably predict :-/ What I usually do is give it 15 mins in prime95 with 80% of the mem being used and go bit by bit until it bsod's in that time frame, then once I find it unstable, I use longer stress tests to find the sweet spot. So you will need to use long tests at some point to dial it in, but you can use the short tests to get it in the ballpark :)
 
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techgeek

techgeek

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Apr 11, 2004
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Sure you can run 1.8V for Vcore, it'll run right up until you hear a pop and see a puff of smoke.

Seriously though, you can and should lower Vcore if you are at an overclock you feel safe running 24/7. So if 4.4GHz is where you want to stay slowly back down your Vcore until you become unstable, then bump it back up a notch. If you plan on lowering it in Windows with a utility, I would stop your stress test, make the adjustment and then restart the stress test. Don't make the adjustment while it's stress testing.

As for how fast it becomes unstable, it depends. Sometimes you'll be right on the borderline and it'll work for a few hours and then either error out or BSOD. Other times you'll get an error or BSOD immediately. I've even seen where guys have run Prime95 for 8 hours and claimed their overclock was stable and hopped on BF3 and 10 minutes and got a BSOD. So it can vary. Ultimately though you want to run the lowest Vcore that's stable. No use stressing the CPU unnecessarily.

P.S. For now I am running my 4770K @ 4.0GHz at 1.088V. Didn't get much time to play with it before I had to go to work. Two and half more weeks before I get home to play with it more. At that frequency and voltage I see low 70's with 8 threads of P95 AVX.
 
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Ze-goldfish

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So far I have run it at 1.25, 1.23, 1.21, 1.19 Vcore with 4.4GHz for 2 hours at each setting before going to the lower setting :) I think I will try setting it at 1.18 Vcore for 2 hours and then if that dont work for 12 hours at 1.19
 
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bdiddytampa

bdiddytampa

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Yeah definitely, you won't damage anything running lower voltage, see how far you can get it, the lower you an get it @4.4, the higher your possible overclocks can be :)
 
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Ze-goldfish

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No, it was a fail typo :p But hope I can get to lower than 1.19 :) Would really like to see just how good a chip I have xD

Sad that it isnt a Extreme overclocker who got mine :p Though im not unhappy in any way that I got it
 
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Ze-goldfish

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Have now run a stable overclock of 4.4GHz with 1.178 Vcore for 10 hours :D Think this is the magic number

When I get home from school I will try to get the ringbus up to 4.4GHz, enabling adaptive mode and setting my RAM to the rated speed :)
 
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techgeek

techgeek

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There is a small issue with using adaptive mode. Have a look at the following link:

Link

Go down to the portion that discusses Adaptive mode. In particular if you have any AVX loads in the software you use, they suggest staying in Manual mode. However if after you've dialed in your overclock and your done stress testing and don't plan on having any AVX loads, then use Adaptive mode.
 
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Ze-goldfish

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thx for the tip though I already know from searching the web, that some stress test and benchmark software will overvolt my cpu if used in adaptive mode :) I dont intend on benchmarking and will not stress test after setting to adaptive mode

Though I didnt know it was because there was something called AVX :p Is it in anything else than stress test or benchmark utilities?

I will only be doing games, 3D rendering, interwebs, normal text editing and programming on the PC :)
 
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techgeek

techgeek

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AVX stands for Advanced Vector Extensions. They're are an extension of the SIMD instruction set. Essentially a higher performing floating point instruction set. Haswell actually has AVX2 which is an extension of the original AVX.

Have a look at this forum thread from Anandtech:

Link

It looks like a few pedestrian applications use it. However as with any new instruction set, it may take awhile for developers to leverage it. They have to see a decent install base before they use resources supporting it. It is something to think about though.
 
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techgeek

techgeek

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I wasn't trying to frighten you away from using Adaptive Mode, just something to think about. Unless you use Handbrake or a codec pack with FFDshow, you should be alright for now. However as time goes by more developers will start supporting it. Seems like compression software is a prime target for a performance boost from AVX, also transcoding software.
 
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Ze-goldfish

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OK :) As I dont use any of that I think I will use adaptive

As I posted yesterday I got a stable 4.4GHz with 1.178 Vcore. I am currently trying to get a 1:1 ratio with my ring bus as I have been told that can improve performance (Is it that important?). The problem is, that no matter what settings I choose I cant get it to run stable at 4.4GHz ring bus. 2 hours ago I then tried lowering the ring bus to 4.3GHz and I havent seen any problems so far (I keep on stress testing this setting for the next 6 hours to be sure it is ok).

Is 4.3GHz ring bus ok for a 4.4Ghz cpu clock?

The settings I have on is:

4.4 GHz cpu clock
1.178 cpu voltage
4.3GHz ring bus
1.178 ring bus voltage
1.9 vccin
 
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techgeek

techgeek

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From what I've read the ring bus doesn't have to be perfectly synchronous, but it should be close to be efficient. I've read that it should be within 300MHz of the core clock. So in your case you could have the ring bus as low as 4.1GHz and still be OK.
 
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Ze-goldfish

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Thx :) It ran without problem for 8 hours at those settings

Am currently trying to OC my RAM to the right place :p though it isnt really working so far... was a piece of cake before cpu OC

The RAM is Kingston HyperX Beast 2400 MHz, but I could not get it stable at 2400 MHz even at 1,71 Volt

I found this http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1029&page=3

and am gona try 1600 MHz at 7-8-7-24, 1T, 1.65 Volt as I have read that all else than high end photo editing and the like works faster with lower latency :)
 
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techgeek

techgeek

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With this generation, I've read that you have a trade-off. If you overclock your core, it gives less room to adjust memory because the IMC is sensitive to the core overclock and vica-versa. The article said core clock is king, meaning you get more from overclocking the core than you get from upping memory bandwidth. The article suggested while overclocking the core, to leave memory at it's default speed to find your maximum. Then while testing for fastest memory speed, to run the core at default. Once you've dialed each in individually, then you try to get the best stable compromise between the two.
 
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