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Stable at 4,9GHz and want to go to 5GHz

post #1 of 39
Thread Starter 
Hi

I am starting another thread because the other is now too long and sometimes there are parallel conversations and quotes difficult to follow at this critical stage of my first overclocking.

Now, I am stable for 2 hours with prime95 and I have these settings:
- Multiplier 49
- BCLK 100
- Core Voltage: what is show on CPU-Z is 1.432V to 1.440V, maybe due to
- Load Calibration which is set to high
- PLL enabled
- C1E and EIST disabled
- CPU capabilility set to 130%
- VRM manual set to 350
- Hyperthreading disabled
- CPU PLL auto
- VCCIO auto

The next step I would like to go is on the multiplier set to 50.

Suggestions after now?

I read to set an offset but this is the difficult part: how to do it...
LLC to extreme or ultrahigh?
C1E and EIST enabled?
Touch CPU PLL or even VCCIO?

Suggestions are welcome. Thanks.

harpsi
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post #2 of 39
2 hours isn't enough to say it's stable and you should know if it is 100% stable before trying to continue. Run 20 passes of max IBT + 12 hours of P95.
post #3 of 39
Thread Starter 
Quote:
Originally Posted by SightUp View Post
2 hours isn't enough to say it's stable and you should know if it is 100% stable before trying to continue. Run 20 passes of max IBT + 12 hours of P95.
Although without BSODs, I got the mouse not working after 3 hours. I am touching all the settings but I am now a little bit lost... :\\ Error 0x101 is coming again. I have LLC now on ultrahigh and core voltage in CPU-Z shows 1.456V with the multiplier at 49. C1E and EIST are enabled. I didn´t understand so much what to do with this LLC. What I know is when I set it to ultrahigh, Vcore on the bios and Vcore on CPU-Z show more closed values...

harpsi
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post #4 of 39
C1E and EIST can be enabled. You'll probably want LLC at ultrahigh and just keep bumping up the increments until you're stable.

But to be honest, I wouldn't do a huge prime blend session at much higher voltage. You might be safer at 4.9 or 4.8 for 24/7. Or settling for 5GHz stable at a shorter-than-12hr prime.

I say this because I've degraded two 2500Ks in my quest to top 5GHz. Neither of those could do it under 1.5v and that seems similar to yours. Maybe just getting it stable over 5GHz and then stepping back is your plan--it would be mine, too.

With your chip you'll more than likely need well over 1.5v to be completely stable (sucks, I know--but you're not alone. My third chip is my best and it still needs 1.5v to be 5GHz stable).

Just keep bumping it up until you're satisfied with its stability--and remember that stable is a relative term here. 3 or 4 hours of prime blend is all I'm willing to do to my Sandy Bridge chips anymore.
post #5 of 39
The difference between 4.8Ghz and 5Ghz is negligible in games. Do yourself a favor and scale back.
post #6 of 39
yah..i'm locked in @ 4.7..this chip can do 5..but ..what's the point? i don't notice any difference..and the temps/voltage are crazy at 5 i know the chip runs hotter..but..@ 4.7=under 60c...1.43v @ 5 = 1.53v..and 74c..temps like that make me nervous
 
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Thuban Powah!
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post #7 of 39
Thread Starter 
Quote:
Originally Posted by Mumbles37 View Post
C1E and EIST can be enabled. You'll probably want LLC at ultrahigh and just keep bumping up the increments until you're stable.

But to be honest, I wouldn't do a huge prime blend session at much higher voltage. You might be safer at 4.9 or 4.8 for 24/7. Or settling for 5GHz stable at a shorter-than-12hr prime.

I say this because I've degraded two 2500Ks in my quest to top 5GHz. Neither of those could do it under 1.5v and that seems similar to yours. Maybe just getting it stable over 5GHz and then stepping back is your plan--it would be mine, too.

With your chip you'll more than likely need well over 1.5v to be completely stable (sucks, I know--but you're not alone. My third chip is my best and it still needs 1.5v to be 5GHz stable).

Just keep bumping it up until you're satisfied with its stability--and remember that stable is a relative term here. 3 or 4 hours of prime blend is all I'm willing to do to my Sandy Bridge chips anymore.
I think that at least concerning temperatures only I can go to 5GHz. Maybe it is not stable. But stability comes not only from Vcore right? What should I do to get it running to 5GHz with Vcore under 1.50V?

Do you think that prime95 running for 12 hours, if possible, can degrade my CPU in one or two days with tests?

Do I need to set an offset because of high voltages? That´s something I didn´t understand until now...

I stopped tests until wednesday because I will be far from the computer. My last specs today were this:
- bclk 100
- multiplier 49
- ram memory set to manual ddr3-1600
- PLL enabled
- EPU power disabled
- LLC ultrahigh
- VRM set to manual 350
- phase control and duty control (I don´t know what they are) set to extreme
- cpu capability set to 140%
- cpu voltage 1.470V
- dram voltage 1.60000
- vccio, cpu pll and pch voltage set to auto
- hypertreading disabled
- EIST and CPU C1E enabled
- CPU C3 and C6 reports disabled

Temperatures under REAL TEMP 3.60 version: under 73ºC (between 60 and 73 more or less)

Core voltage under CPU-Z: 1.456V

Now, the question is: what to do with those values in order to get 5GHz, if possible.

harpsi
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post #8 of 39
Thread Starter 
Quote:
Originally Posted by SightUp View Post
The difference between 4.8Ghz and 5Ghz is negligible in games. Do yourself a favor and scale back.
And what is the difference between the original 3.4 (3.8 with turbo boost?) and 4.9? Is a lot or not so much? If differences are not so much, I think I can get it stable at 4.9...

harpsi
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post #9 of 39
Quote:
Originally Posted by harpsi View Post
And what is the difference between the original 3.4 (3.8 with turbo boost?) and 4.9? Is a lot or not so much? If differences are not so much, I think I can get it stable at 4.9...

harpsi
The difference between 3.4 (3.8) and 4.9 is definitely noticeable--that's why we overclock. But not only is 100MHz a hard difference to see, there are also diminishing returns and even performance loss as heat and voltage go up.

For instance, on a previous chip I got better scores benchmarking at 4.8GHz than 4.9GHz, most likely due to the big jump in heat (4.8GHz was the chip's de facto limit).

Your chip sounds like a 4.8GHz one, or 4.9GHz if you really want to push it.
post #10 of 39
Quote:
Originally Posted by harpsi View Post
I think that at least concerning temperatures only I can go to 5GHz. Maybe it is not stable. But stability comes not only from Vcore right? What should I do to get it running to 5GHz with Vcore under 1.50V?

Do you think that prime95 running for 12 hours, if possible, can degrade my CPU in one or two days with tests?

Do I need to set an offset because of high voltages? That´s something I didn´t understand until now...

I stopped tests until wednesday because I will be far from the computer. My last specs today were this:
- bclk 100
- multiplier 49
- ram memory set to manual ddr3-1600
- PLL enabled
- EPU power disabled
- LLC ultrahigh
- VRM set to manual 350
- phase control and duty control (I don´t know what they are) set to extreme
- cpu capability set to 140%
- cpu voltage 1.470V
- dram voltage 1.60000
- vccio, cpu pll and pch voltage set to auto
- hypertreading disabled
- EIST and CPU C1E enabled
- CPU C3 and C6 reports disabled

Temperatures under REAL TEMP 3.60 version: under 73ºC (between 60 and 73 more or less)

Core voltage under CPU-Z: 1.456V

Now, the question is: what to do with those values in order to get 5GHz, if possible.

harpsi
And about this:

To use offset you basically start with VID (which is more or less the base set voltage your particular CPU runs at a given speed i.e. it varies from chip to chip), and increase or decrease voltage from there. For you, you're looking at +1.2v or probably even more depending on your VID to get up to 1.5v. The benefit of offset is that your voltage drops when the CPU is idle so you save power and heat, etc.

Whether offset helps in stability no one can really say for sure--it doesn't help my current chip, though one of my previous chips seemed to like it.

vccio does not need to be changed since you seem to be running your RAM at stock, and PCH should not be changed. One thing you can do is try to increase or decrease your CPU PLL, as some have reported enhanced stability. Again, varies from chip to chip; mine does best at 1.74v.

If I were you, I would turn on hyperthreading (that's the main benefit of the 2600K), set CPU to 4.7 or 4.8GHz, set CPU capability to 120%, and use normal voltage set at 1.4v with ultrahigh or extreme LLC. Then I would test for stability and if stable, bump it down .01v, stability test, bump down one more notch, etc., etc. until I had a nice stable 4.8 or 4.7GHz at minimum voltage.

I don't think it's possible, no matter what you do, for your chip to do 5GHz under 1.5v. I'm in the same boat.
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