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Haswell Overclocking Guide [With Statistics] - Page 26

post #251 of 19539
I bought a 4770k over the weekend and have been messing with it over the past couple of days.

My stable 24/7 overclock, 4.6GHz at 1.25V:
http://valid.canardpc.com/2881515

Highest I have went so far, 4.9 GHz at 1.35V:
http://valid.canardpc.com/2883023

I would really like to get a 5GHz overclock, but I am not too sure if I want to push the voltage up to more. I am also not planning on delidding.
post #252 of 19539
Quote:
Originally Posted by FFOX View Post

I bought a 4770k over the weekend and have been messing with it over the past couple of days.

My stable 24/7 overclock, 4.6GHz at 1.25V:
http://valid.canardpc.com/2881515

Highest I have went so far, 4.9 GHz at 1.35V:
http://valid.canardpc.com/2883023

I would really like to get a 5GHz overclock, but I am not too sure if I want to push the voltage up to more. I am also not planning on delidding.

What kind of stress testing have you done at those settings? 4.9 @ 1.35V is very good.
post #253 of 19539
Quote:
Originally Posted by Forceman View Post

What kind of stress testing have you done at those settings? 4.9 @ 1.35V is very good.

No stress testing for the 4.9@1.35V. I was hoping to get 5@1.35V but settled for 4.9. I was assuming that if it was somewhat stable, it would probably run insanely hot.
post #254 of 19539
Quote:
Originally Posted by Darkwizzie View Post

I just noticed the highest overclock I have of a 4670k is 4.6ghz. I assume that's because people who can afford to stress and survive the temperatures can afford 4770k. I wanna be the one with 47 now lolol.

I am currently testing a 4.7 GHz @ 1.280V OC with my 4670K, but I posted my 4.6 GHz @ 1.218V because it is my 24/7 OC. I have also dabbled with 4.8 @ 1.335V but the temps get pretty high if it is tested with Linpack or even IBT. Prime isn't as bad, but I just don't have time to let it run for hours and hours unsupervised. I have noticed that from stock all the way up to 4.6 every increase of the multi fits an almost uniform increase of voltage, until I get to 4.7. After that it wants more voltage and is much more difficult to stabilize. I just don't know if there is a real benefit to run my CPU at 4.7 vs 4.6 for any prolonged amount of time, besides being able to post the results here. But I am not doing this to compete with others here, I just want to find the optimal OC for my chip and contribute accurate numbers and info to the data pool.
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post #255 of 19539
Any explanation why my temps instantly jump from an average of 78c to an average of 99c while blend stress testing with prime?

The temps are fine for 30-45 minutes and then it jumps to crazy temperatures and the cpu starts throttling. It doesn't lock or anything though and the test are still passing.
post #256 of 19539
Probably the point when it starts using AVX. IBT does the same thing.
post #257 of 19539
Quote:
Originally Posted by razlebol View Post

Any explanation why my temps instantly jump from an average of 78c to an average of 99c while blend stress testing with prime?

The temps are fine for 30-45 minutes and then it jumps to crazy temperatures and the cpu starts throttling. It doesn't lock or anything though and the test are still passing.

If you look at the FFT, it changes from large to small. Small FFT is good for producing heat while large FFT is better for finding instability in your RAM. If you fail on large, but pass on small then it probably means your RAM overclock is unstable. If you fail on small, it means your CPU is unstable.

If you fail almost instantly (within 30 minutes), then your vcore is too low. Try raising vcore in increments of 0.005V until you can pass at least 2 hours of blend, although it's up to you how long you want to be stable. I find that 2 hours of blend stability is equal to pretty much stable unless you are doing very intensive tasks such as folding, autocad, etc.
Quote:
Originally Posted by Forceman View Post

Probably the point when it starts using AVX. IBT does the same thing.

Prime95 uses AVX throughout it's entire testing.
Edited by Ryude - 8/6/13 at 9:32pm
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post #258 of 19539
I wonder if Prime95 BSODs my 4770K 4.4GHz using 1.28V because of AVX instructions or something else. If it is something else, as long as it is stable with a version of Prime95 prior to AVX support and I use Adaptive Vcore so that's it automatically boosts Vcore by up to 0.1 V when the AVX instructions are being used, I should be fine with real world applications, right? Just wanna lower the Vcore while not losing stability with real world apps like video encoding.
post #259 of 19539
Quote:
Originally Posted by Anusha View Post

I wonder if Prime95 BSODs my 4770K 4.4GHz using 1.28V because of AVX instructions or something else. If it is something else, as long as it is stable with a version of Prime95 prior to AVX support and I use Adaptive Vcore so that's it automatically boosts Vcore by up to 0.1 V when the AVX instructions are being used, I should be fine with real world applications, right? Just wanna lower the Vcore while not losing stability with real world apps like video encoding.

You don't have to use stress tests. As long as you feel comfortable with it's stability, that's good enough for you. The stress tests are simply there to give you an idea of how stable it may be. Even passing every stress test for 24 hours, you can still get a BSOD. Overclocking is always going to reduce stability to some degree.
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post #260 of 19539
Thread Starter 
Quote:
Originally Posted by Ryude View Post


If you look at the FFT, it changes from large to small. Small FFT is good for producing heat while large FFT is better for finding instability in your RAM. If you fail on large, but pass on small then it probably means your RAM overclock is unstable. If you fail on small, it means your CPU is unstable.

If you fail almost instantly (within 30 minutes), then your vcore is too low. Try raising vcore in increments of 0.005V until you can pass at least 2 hours of blend, although it's up to you how long you want to be stable. I find that 2 hours of blend stability is equal to pretty much stable unless you are doing very intensive tasks such as folding, autocad, etc.
Prime95 uses AVX throughout it's entire testing.

Interesting, I'll add that to the guide.

 

I've fixed a few typos in the chart, added little bit info on Uncore voltages. Removed one invalid result from the chart. Added a wee bit more on HWMonitor/HWInfo info.


Edited by Darkwizzie - 8/7/13 at 12:36am
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Hard DriveHard DriveHard DriveCooling
Samsung 950 Pro 512gb (Undelwalt) WD Red 2tb (Pack Yak II) Seagate Expansion Drive 5tb (Phoenix Down II) 3x560mm HardwareLabs Nemesis GTX 
CoolingCoolingCoolingCooling
XPSC Raystorm Pro Watercool Heatkiller 1080ti Full Cover Waterblock EK XTOP Revo Dual D5 (Serial, PWM, v4) EK ZMT (1/2 - 3/4 ID OD) 
CoolingCoolingCoolingCooling
14xEK ACF (Compression Fittings) EK x4 250 (v2) Distilled Water + PT Nuke (Copper Sulphate) 24x140mm Silent Wings 3 
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Windows 10 Pro 64bit Catleap 27 Inch 2560x1440 IPS 60hz Display Coolermaster Storm Trigger (Brown Switches) EVGA P2 1000w 
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Aquaero 6 LT + Aluminum Heatsink 
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