Need help achieving 4.5 GHz Stability on i5 3570k

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Platinum_Gamer

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Hey guys,

I just need help getting 4.5 GHz stable on my i5 3570k. My setup is in my sig I think.

Current 4.5 GHz OC profile is:

CPU Ratio: x45
Vcore: Offset +0.040V
LLC: Level 2
C States: Off
E1S: On
Spread Spectrum: Disabled
Power Planes: Auto

Using Prime95 Blend test and my Vcore is around 1.296V on CPUZ and temps are max 91 Deg Celsius; so I backed off. On BF4 Lockers 64p, I crashed within 5 minutes of gameplay, but temps were around 67-70 Deg.

Ambient temp feels 'just fine' I guess around 25 maybe?

On a side note, I have reverted back to my 4.2 GHz (more stable) and trying out offset -0.05V, and at load I have a Vcore of 1.200V and Im getting max 77 Deg Celsius on Blend Prime95 (which I think is very high for 4.2 Ghz)

So guys, do I have a really bad chip? Can I achieve 4.5 GHz?
 
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Sc0urgeTR

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K edition processors are designed with OCing
in mind.

You don't want your chip to ever go over 75 degrees....
If you keep doing this you may not have a chip.

In order to maintain stable temperatures
look into a CPU water-block.
These are sealed units that act like a radiator
in a car. Sometimes people get a bit worried
because of the fact it runs liquid through it's
tubing. However this really isn't an issue.

Also make sure your motherboard certifies that it is OK for OCing.
Lastly make sure your PSU has head room for extra draw.
 
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Platinum_Gamer

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I think my mobo, the Asrock Z77 Extreme4 is suitable for OC. I've seen many people reach 4.5 Ghz easily with this board and IB chips.
My PSU is rated at 650W so it still have plenty of headroom left for OC as I only use 1 GTX670.
 
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Sc0urgeTR

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Yup most likely you need to get better cooling.
Again I still advise a waterblock.

My CPU went from 44c down to 23c.
I can OC it to 4.5GHz if I want.

However, there's really no performance advantage over 4GHz
is what many OC reports suggest. If this is true it'd be better
off just OC to 4Ghz and letting your components endure less stress
for a possible longer system life cycle.

 
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Platinum_Gamer

Platinum_Gamer

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Well 4.2 Ghz is pretty good, but I feel greedy and I want more performance from my CPU. I find it extremely weird how some ppl can get 4.5 GHz with 1.25V with max temp of <80 Deg with the same setup. This makes me think that I should start touching other things like PLL voltage.
 
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Sc0urgeTR

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Can look into alternative thermal pastes,

Your case materials and it's fans can play apart in temperature dissipation.
Typically for 4.5GHz auto settings are able to handle this for voltage controls.

You can mess with it if you want. But over all I'd say a better cooling device for the CPU
will provide a stable system when OCing.
 
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Platinum_Gamer

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Hmm, even if better cooling can reduce my temps below 90 Deg under Prime95, I might need to use insane amounts of Voltage to actually stabilize my 4.5 Ghz OC. I remember I used to use 1.314V and it still wasn't stable + it was extremely hot under load.
Maybe I am using too much voltage, as I have never tried 4.5 GHz with 1.25V.
 
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Sc0urgeTR

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Most setups achieve 4.5GHz with auto voltage settings.
I know I did.


http://www.buildcomputers.net/cpu-temperature.html

Core i5-3570K

idle temps: 28 to 35°C
normal temps while under load: 50 to 62°C
max temp before burning out: 67°C

At 77 degrees your chip will probably burn out.

You can't even check for stability of voltage
because the temps are so high it affects your voltage
anyway.


The effect of temperature on voltage.
http://www.tutorvista.com/physics/effect-of-temperature-on-voltage
Higher temps means more resistance, thus less voltage.
Voltage being the pass through of current from one conductor
to another. Its this flapping we want to avoid. So if you readuce
your temperatures you'll enable less resistance and hence
require less voltage to maintain a stable system while
not requiring higher levels of voltage.
 
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Platinum_Gamer

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Unfortunately I was not able to achieve 4.5 GHz with auto voltage and lvl 2 llc. The vcore reading with that voltage setup was around 1.256V and most of my programs crashed during boot, and my testing programs were not able to stay open.

However, I think using offset +0.05 and lvl 2 llc is giving me a stable OC at 4.4 GHz. Weird how 0.1 GHz requires much more Vcore...
 
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Platinum_Gamer

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I understand what you're suggesting; cooling is my issue. A higher temp = more resistance, and V=IR, so a higher voltage is needed, which further increases temp and resistance. However, many people with the same setup as me, with the same thermal paste (provided by the Hyper 212 Evo) have gotten easy 4.5 GHz overclocks. What they don't say however are other things like PLL voltage etc...

Honestly, I don't think I can cook my CPU with 77 deg C for a few seconds. Many benchmarkers show their results with temps >85 Deg C.

So, I ask, how may I achieve 4.5 GHz without buying new hardware, because mine is adequate enough for a 4.5 GHz OC (Unless my CPU is not very good; bad luck).
 
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