New cpu cooler coming tomorrow, need help with OC preperation

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Vikerules

Vikerules

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Feb 28, 2016
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So I've had my i7-4790k for about a year now and on top of it has been a CM hyper evo. Stock voltage when I bought it was 1.21 and I bumped it up to 1.25 at 4.6ghz and its been sitting at that voltage and ghz for the entire year and so far temps have been completely within acceptable boundaries. Note that I never did stress test the cpu for stability instead I just bumped voltage up abit and its been completely stable so far.

The new cooler coming is the "godlike" Noctua NH-D15 (I don't like water in my pc and silence is one of my top priorities). However this time around I want to get up to 4.8 (maybe 4.9 if zeus will bless me) and stress test the cpu for stability to find the lowest stable voltage required for said Ghz. This is where I need help, how do I test the overclock for voltage stability? I've head people saying some programs should not be used for the 4790k because it will put too much unnecessary heat into the cpu...
 
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geofelt

geofelt

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How high you can overclock will be determined by your luck in the bin lottery.
Stress testers like IBT and Prime95 use a subset of instructions that generate heat.
I like to use OCCT which will use more normal instructions.

How high you can OC should be limited by the vcore you can tolerate.
For 24/7 use, you do not want to go higher than 1.3v.

When you reach your limit, implement speedstep and adaptive voltage.
That will reduce your multiplier and vcore when your processor has little to do.

Be prepared, your NH-D15 is HUGE. You should be able to use one of the included low noise adapters to tone down the fans too near silence.
 
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L

Luke2468

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Hi there, i too just got a new CPU cooler for my i5 4690k ( the cooler master master air maker 8) and it does make a difference. Anyways, to test voltage/system stability i use the Intel Extreme Tuning Utility and i let that run for a good 4-5 hours. If you want to see if your temperatures are all good i use Prime95 ( NOTE: DO NOT USE ANY VERSION OF PRIME95 OVER VERSION 26.6 IF YOU'RE USING HASWELL heres a link to get version 26.6 http://www.mersenneforum.org/showthread.php?t=15504)
 
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Vikerules

Vikerules

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Thanks ill check these out, first noctua product ive ever bought so i hope it will live up to the hype.



Ok i'll try and stay at 1.3 or below, how will i know when i've reach my limit? and what will i look for if the stability test fails? isnt offset voltage better than adaptive? i think im gonna use the other fan connector so that i can run the fans with PWM and control them myself. I've also checked compatibility so everything should fit perfectly :)



No version above 26.6 got it, thank you
 
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geofelt

geofelt

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OCCT will supposedly graph vcore as you run.
I wonder if it is accurate for vcore

OCCT will shut down the test if temperatures reach 85c.
I also run cpu-Z which I think is accurate for vcore.

How you get the motherboard to back off the multiplier and vcore when not busy will differ by brand.
The terminology seems to be different for the same knobs.
It has been a while since I set mine up so I do not recall the process exactly.

If you have fast ram, it will need higher voltages if you use xmp settings.
As I recall, that higher voltage negatively impacted my ability to raise the multiplier.
Faster ram is offset by higher cas numbers so there is little net difference in performance.
http://www.anandtech.com/show/7364/memory-scaling-on-haswell
 
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Vikerules

Vikerules

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im running offset vcore and windows power plan set to balanced and the vcore goes down to 0.7 and 800ghz, or will adaptive do something different?
 
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geofelt

geofelt

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You are good, the terms I used are what I recall as being needed to accomplish the multiplier reduction and vcore reduction when not busy.
 
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Vikerules

Vikerules

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UPDATE...

Extremly easy cooler to mount, had to remove my gpu tho to be able to clamp in the fans but no biggie.

Im stress testing the stability as we speak with trial version aida64. Windows booted at 1.25v 4.7ghz and i stress tested it for 20 minutes and everything was fine and dandy. Windows did not want to boot at 4.8ghz, 1.25v, 1.27v but did boot at 1.29v. Im now stress testing at 4.8ghz 1.29v and temps are sitting at 67-69c. Should i lower the vcore a little bit more if its stable as of now and find the vcore sweetspot?

QUESTION: if the OC passes aida64 stability test, am i good to go? Or should i use another stress test program? Would it be worth it if i could get stable 4.9ghz at around 1.32v? Or should i stick to 4.8?
 
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