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Need Advice on an i7 4770k 4.5 Ghz AIR Cooled Overclock

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August 5, 2014 5:11:37 PM

I have an i7 4770k that I am overclocking for the first time.
First of all, let me get my relative components out of the way so you know what I am working with.

CPU | i7 4700k (Batch# 3326C543)
CPU Cooler | Noctua NH-D14
PSU | EVGA SuperNOVA 850 G2
MotherBoard | GIGABYTE GA-Z87X-UD5 TH
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(If any more information is needed please specify)

At the moment I seem to be running stable at 4.5 Ghz with a max temp of 76C and an average of 72C when running a system stability test on AIDA64, stressing everything that it allows me to. My idle temp is usually about 32C. Also as a random note I want to mention that I'm comfortable with any temp at 80C or below.

I am running in Static Mode just to be clear.
My Vcore Voltage is 1.238 and has passed the AIDA64 Wizard Benchmark test to also verify stability.
My Uncore is set to 34x (Im still not sure if this matters when not using Adaptive Mode)

The information above I feel I have a decent understanding of even though I've only started doing this a few days ago so here is what I need to know...

Ive read countless articles and watched many videos on overclocking with my processor so please do not send me links to answer my question unless it absolutely defines what I need to understand.
What I dont understand is what to set my processor cache ratio at (I was hoping for 4.4 since 1:1 ratios seems to be rare) but I do not know how to tune the voltage for this. I know where to tune my processor cache voltage, but I don't understand what to set it at. At the moment it is at 35x with a voltage of 0.8


Any help or comments would be greatly appreciated if you have experience with this as I am completely new to this, thanks in advance.

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a b K Overclocking
a b à CPUs
August 5, 2014 5:30:36 PM

Hi there!
First off, amazing choices for the components in your build. :) 
You are completely right, 4.4 GHz would be the best result possible. Set your cache voltage to 0.03 below what you CPU core voltage is. For example, you should be stable from 1.210-1.225. Try 1.210 at 4.4Ghz, and if that isn't stable try 1.225. If THAT doesn't work, lower the cache ratio to 4.3, and so on.
Best of luck! :D  Let me know how you go.
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August 5, 2014 5:43:35 PM

Alex Kelly said:
Hi there!
First off, amazing choices for the components in your build. :) 
You are completely right, 4.4 GHz would be the best result possible. Set your cache voltage to 0.03 below what you CPU core voltage is. For example, you should be stable from 1.210-1.225. Try 1.210 at 4.4Ghz, and if that isn't stable try 1.225. If THAT doesn't work, lower the cache ratio to 4.3, and so on.
Best of luck! :D  Let me know how you go.



Thanks for the informative response. I'll try it within the hour and see how that goes. That, and as soon as I can I'll get back to you to let you know if it worked or not. But those voltages sound like theyll do the trick. Much appreciated.
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a b K Overclocking
a b à CPUs
August 5, 2014 5:46:32 PM

No worries at all, you're very welcome.
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August 5, 2014 6:53:28 PM

Alex Kelly said:
No worries at all, you're very welcome.

Ok, so Im not really asking for advice since I realize that I am going to have to do a lot more research to figure out what is going on but I thought an update would be nice for anyone following and if you want to give some input I wouldn't mind that either.

I turned up the voltage while at 44x to the two recommended voltages for the cache v and both times during the AIDA64 Wizard bench it crashed. So I turned the cache down to 43x with 1.210 v for the chache voltage and it also crashed.
Then I went back to what I originally had at 4.5 ghz and ran the bench again. (The cache back at 35x and no voltage change) When the process got to the FPU Juilia test, I hit a max of 100C out of no where. The system crashed of course and then I am not booted back up at default settings from the BIOS for the time being.

I am going to look more into why this has occurred but it may take me a few days.
I'll get back to this when I have more information.

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a b K Overclocking
a b à CPUs
August 5, 2014 10:50:49 PM

That's very odd that your CPU spiked to 100C suddenly... Were you using a Vcore voltage of 1.238?
It is normal that it crashed when adjusting the cache ratio, though. For my chip, I have to keep my cache ratio at 3.9GHz while my OC is at 4.3GHz. Leave the cache voltage at 1.220 and continue to go down (4.2, 4.1, 4.0 etc) until you get it stable.
Best of luck!
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August 5, 2014 11:27:54 PM

Eventually I placed the CPU at 39x with the recommended voltage and set it to static before running the same test. Again on FPU test I went very high, this time to 89 C. I ran multiple monitoring systems to check the temp and my readings for some were at that temp while others were very low considering. This is the only test that has increased my temp that high. I run benchmarks and stress tests from many different utilities and it never gets that high. Even when gaming at 45x and doing other "real world tests" I never went past 72C. Its only on the FPU tests, Ive been trying to find more information about it all night but havn't gotten very far. Honestly I feel comfortable where I was at 45x for real world applications.
Anyhow you solved my first question a long time ago and I will still be using that as a guide line to figure out my cache voltages so I'm sure to find something to work from there. As for the FPU problem I'm going to have to try again another day.
Thanks for all the responses you've been very helpful.
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a b K Overclocking
a b à CPUs
August 5, 2014 11:30:20 PM

No worries mate!
Please PM me letting me know how you go. We'll get this sorted :) 
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August 7, 2014 1:45:57 PM

Ok this is my final comment on this post as a final update for anyone that this may help in the future.
At the moment I am running 4.3 ghz on the 4770k with a 4.2 cache. (Eventually i'll be moving up higher with my multipliers after feeling all is well)

Basically I can run the AIDA64 Stability test with Max load on everything including the GPU's I have and my max temp with the CPU is 70C

I'm not entirely sure why the FPU stress test on its on is so intensive but I kind of view it as an unrealistic load that would never happen in any practical use so I am not going to run it.

You'll have to do your own research to be able to make the decision as to if you would want to use that test or not.
I have also used an Intel Burn Test (Lin Pack) Recommended by Alex Kelly that helped me verify stability as well as having no problems for a couple of days now.

As a last note, the voltage recommendations provided by Alex Kelly worked perfectly.
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