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Poor i7 2600K at OCing or just me being a novice?

post #1 of 11
Thread Starter 
Hi all,
After trying to familiarise myself with the differences in overclocking that are done on a Sandybridge compared to, say... an i7 first generation or AMD, I've been trying to get to at least 4.5GHz with reasonable temperatures and voltages. Unless I'm missing something, my temperatures are rather high (one core reached up to 90C on a Prime95+Linx stress test over an hour each) and the voltage is set in offset mode (as I prefer dynamic voltage adjustment depending on usage) about +0.020, which under load makes it around 1.35v with loadline calibration at level 3 (level 1-5).

My system specs are roughly as follows:
- Asrock Z68 Pro3-M with BIOS version 1.40
- Corsair H70 CPU Cooler using AS5 (maybe I haven't given enough curing time for the AS5?)
- i7 2600K currently at 4.4GHz on 1.35v using offset mode with loadline calibration at level 3
- 2 x 2GB Corsair XMS3 1600 (auto clocked currently at 1060) 9-9-9-24 running at 1.575v (auto again), I might need to buy new RAM later on, unless this is why my CPU is struggling to overclock to 4.5GHz at slightly lower voltages? It came out of my i7 920 system originally
- Using integrated graphics for now

The system ideally is currently designed to be a fast desktop server system, not a gaming machine, later in the year I will buy a dedicated GPU and perhaps make it into a complete gaming machine.

Any suggestions? Or does anyone need to know other voltages or BIOS settings? Any settings I haven't mentioned are probably auto anyway.

I was following a few OCing guides, I have also been using fixed voltages as opposed to offset but they just produce the same results as I'm getting now.

Voltages any lower than 1.35v cause BSOD's.

Many thanks.
Edited by Ixel - 8/7/11 at 9:21am
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post #2 of 11
Set the voltage to 1.4v and 4.5GHz, mine takes 1.37v to hit 4.5 so 1.4 would be the fail safe. From there, just step it down until it becomes unstable.
    
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post #3 of 11
Thread Starter 
I see, I'll try that, what's your view on my temperature by the way? Obviously initially increasing vcore to 1.4 will make it higher I imagine, as if it's not high enough already (one core reached 90C). Also I heard the safety margin for i7 2600K or similar type of CPU's is, well, some people say 1.35v, some say 1.40v, I imagine anything 1.40v or less is still in the safe zone for 24/7 use? Especially if I use offset mode instead of fixed mode for vcore?
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post #4 of 11
Quote:
Originally Posted by Ixel View Post
I see, I'll try that, what's your view on my temperature by the way? Obviously initially increasing vcore to 1.4 will make it higher I imagine, as if it's not high enough already (one core reached 90C). Also I heard the safety margin for i7 2600K or similar type of CPU's is, well, some people say 1.35v, some say 1.40v, I imagine anything 1.40v or less is still in the safe zone for 24/7 use? Especially if I use offset mode instead of fixed mode for vcore?

Well, with Sandy, Intel says 1.5 is the max but I wouldn't feel comfortable over 1.45.

Also, on temps, as long it stays under 75c it's ok.

EDIT: OK WOW! 90c is WAY to high. What cooler are you using? Try reseating it and replacing the Termal Paste. Even the stock ones can hold a 5GHz OC.
    
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by snelan View Post
Well, with Sandy, Intel says 1.5 is the max but I wouldn't feel comfortable over 1.45.

Also, on temps, as long it stays under 75c it's ok.

EDIT: OK WOW! 90c is WAY to high. What cooler are you using? Try reseating it and replacing the Termal Paste. Even the stock ones can hold a 5GHz OC.
I see, and yes, that was the max temp it reached, seeing others I thought that might be a little high, ok perhaps not a little :x. I'll get it re-seated and post again once I have new results. I'll stick to 1.40v or less, as a guideline then, and remain using offset mode for vcore as I feel it's probably better for the CPU when idle for example not to have the same volt going through it as if it was under load. I definitely can't do 4.5 with any voltage much higher than 1.35 so I'll get it reseated and replace the thermal paste. Am I right in saying that the size of a very small pea in the center of the CPU is adequate and right for applying it?

I've put system specs on my profile now, and I'm using a Corsair H70.
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post #6 of 11
Quote:
Originally Posted by Ixel View Post
I see, and yes, that was the max temp it reached, seeing others I thought that might be a little high, ok perhaps not a little :x. I'll get it re-seated and post again once I have new results. I'll stick to 1.40v or less, as a guideline then, and remain using offset mode for vcore as I feel it's probably better for the CPU when idle for example not to have the same volt going through it as if it was under load. I definitely can't do 4.5 with any voltage much higher than 1.35 so I'll get it reseated and replace the thermal paste. Am I right in saying that the size of a very small pea in the center of the CPU is adequate and right for applying it?

I've put system specs on my profile now, and I'm using a Corsair H70.
You have an H70, so it's probably a problem with the seating or the Thermal Paste, the H70 should be able to handle even 5GHz easy.
    
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by snelan View Post
You have an H70, so it's probably a problem with the seating or the Thermal Paste, the H70 should be able to handle even 5GHz easy.
I see, yeah it's a fairly decent cooler so I was surprised myself. I'll get paste cleaned and re-applied in the size of a small pea in the middle of the CPU and re-seat again. It couldn't surely be that I haven't allowed 200 hours~ curing time?
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post #8 of 11
Too hot. I guess that Corsair can't keep up with the excess heat and high voltage!
 
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post #9 of 11
Quote:
Originally Posted by Ixel View Post
I see, yeah it's a fairly decent cooler so I was surprised myself. I'll get paste cleaned and re-applied in the size of a small pea in the middle of the CPU and re-seat again. It couldn't surely be that I haven't allowed 200 hours~ curing time?
No, but sometimes it can take like 4 or 5 hours.

@ Above poster, the H70 should EASILY be able to handle that heatload.
    
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post #10 of 11
Thread Starter 
Well the system has been running since early afternoon yesterday (UK time), so that should cover your 4-5 hours minimum curing time easily. I'm in the process of sorting the system out, I'll leave it idle overnight when re-assembled so as to allow some curing time and then stress it again in the morning, I'll update results when I have them. I'll also submit a photo or two of the setup, showing airflow direction and the amount of paste applied again, that is, if I remember while doing it. Either way I'll submit a photo showing the airflow direction at least.

Thanks for your help so far.
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