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Arghhh... What else to eek that extra 300Mhz?

post #1 of 18
Thread Starter 
Ok, it's been almost a week and I haven't made much progress. I'm stable w/ my 2500k at 4.7Ghz @ 1.3Vcore, 1.69Vpll, 1.1Vccio/tt and 1.5Vram BUT nothing beyond that. I've tried all the way to 1.5Vcore and up the Vccio/tt to 1.2 and still can't even boot into windows beyong 47 multi. Could those lucky few who made it to 5 kindly post your Vcore, Vccio/tt, Vpll? I'm SUPER envious of the 5Ghz club and checked the database but I can only see Vcore...

I've enabled ultra high Load line calibration for Vcore, C1E, EIST (Enhanced Intel Speed Step?)

Tx gents!
    
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post #2 of 18
Have you tried turning on Internal PLL overvoltage?
Also did you set long and short current limit up? like at 255?
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post #3 of 18
Thread Starter 
Quote:
Originally Posted by Tunagoblin View Post
Have you tried turning on Internal PLL overvoltage?
Also did you set long and short current limit up? like at 255?
Ah sorry, I left that out.

What I meant is that I tried max out Vcore @ 1.5, Vpll @ 1.825, Vccio/tt @ 1.2 and still no beef. Hence the hope to see others' settings.

Interesting bit is that I always get stopped out at the screen where the four coloured dots are rotating and in the process of forming the window...

I'll look into the long and short current limit and report back. Thanks.
    
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post #4 of 18
Some, actually the vast majority of SB chips will not reach 50x+ multi's. It is something like 50% will hit 4.5-4.6, 40% will hit 4.7 , 10% will do 4.8-4.9 and all the way down to 2% for 5.0+. That was from testing of hundreds, if not thousands of SB chips by Asus. Not saying yours will not reach it, just not to expect it and anything over 4.6 is a blessing. SB chips hit a multi wall and no matter how much voltage you put through it, it will not become stable once it reaches that wall for your specific chip. I hope you have one of the good ones, but if you can't get to 4.7 at 1.5v, I fear no matter how much you tweak, you will never see anything higher than 4.8 stable.

Mine will not go past 4.7 without instability, no matter how much voltage I put into it. I've went as high as 1.6 and still wouldn't boot into windows.
post #5 of 18
actually , most do reach 5 ghz

range for these chips is 4.9-5.6

whatever testing asus was doing, it wasnt with pll overvoltage enabled im guessing

cause the 2 percent over 5 is bunk bro, total bunk
post #6 of 18
I'm just going by what was said in this thread on [H]. Looking at it closer, it was before Pll OV was implemented it looks like. He never updated after, so you may be right.

I still don't think a very high percentage will go over 5.0 though. Not with air cooling anyway. I still bet 10% or less will hit 5.0+.
post #7 of 18
Quote:
Originally Posted by Alecela View Post
Ok, it's been almost a week and I haven't made much progress. I'm stable w/ my 2500k at 4.7Ghz @ 1.3Vcore, 1.69Vpll, 1.1Vccio/tt and 1.5Vram BUT nothing beyond that. I've tried all the way to 1.5Vcore and up the Vccio/tt to 1.2 and still can't even boot into windows beyong 47 multi. Could those lucky few who made it to 5 kindly post your Vcore, Vccio/tt, Vpll? I'm SUPER envious of the 5Ghz club and checked the database but I can only see Vcore...

I've enabled ultra high Load line calibration for Vcore, C1E, EIST (Enhanced Intel Speed Step?)

Tx gents!
Vccio and Vpll as you call it, so I hear, have nothing to do with stabilizing your system. My understanding is that they control other things.

My questions would be:
1) What is the exact error your are getting in blue screen,
2) Under what specific set of circumstances do you crash/fail (for example is it during boot, Prime, Prime Blend, AVX instructions (e.g. IBT), using web browser, watching a video.. etc)
3) Did you enable Internal PLL Overvoltage (this is necessary past 47x)
4) What was LLC for your 4.7ghz overclock
5) Which C-states are enabled, disabled, or set to auto. Specifically list all of them.

Please be careful with LLC if your voltage is above 1.45. It will cause spikes (that you will not likely see in CPU-Z, though I do know a few workarounds to actually see the spike) above 1.52. I don't know whether the Core i cpus are capable of handling intermittent spikes above 1.52, or whether anything above 1.52 is dangerous, so beware of that.

You're lucky to have a chip at 4.7 that low. What stability testing did you do, and how long have you had it at 4.7? Did you test it under light loading conditions (browsing the internet, watching a video or playing a non-cpu-intensive game gets blue screens for quite a few people)?

Quote:
Originally Posted by Alecela View Post
Interesting bit is that I always get stopped out at the screen where the four coloured dots are rotating and in the process of forming the window....
Always provide details like this - sounds like Internal PLL Overvoltage is disabled, but honestly, for me, I couldnt even get that far until I enabled it. I either got a blinking cursor or I got a 0x9C machine check. Once I reached the Windows logo, the only thing left was to add more Vcore.

Even if you can reach a multi of 47 at 1.3v does not mean you will necessarily be able to go higher.

Also, do tell us about what your power limits were set to. You should set them to 250.
Edited by donkrx - 8/1/11 at 11:14am
    
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post #8 of 18
Quote:
Originally Posted by donkrx View Post
Vccio and Vpll as you call it, so I hear, have nothing to do with stabilizing your system. My understanding is that they control other things.

My questions would be:
1) What is the exact error your are getting in blue screen,
2) Under what specific set of circumstances do you crash/fail (for example is it during boot, Prime, Prime Blend, AVX instructions (e.g. IBT), using web browser, watching a video.. etc)
3) Did you enable Internal PLL Overvoltage (this is necessary past 47x)
4) What was LLC for your 4.7ghz overclock
5) Which C-states are enabled, disabled, or set to auto. Specifically list all of them.

Please be careful with LLC if your voltage is above 1.45. It will cause spikes (that you will not likely see in CPU-Z, though I do know a few workarounds to actually see the spike) above 1.52. I don't know whether the Core i cpus are capable of handling intermittent spikes above 1.52, or whether anything above 1.52 is dangerous, so beware of that.

You're lucky to have a chip at 4.7 that low. What stability testing did you do, and how long have you had it at 4.7? Did you test it under light loading conditions (browsing the internet, watching a video or playing a non-cpu-intensive game gets blue screens for quite a few people)?



Always provide details like this - sounds like Internal PLL Overvoltage is disabled, but honestly, for me, I couldnt even get that far until I enabled it. I either got a blinking cursor or I got a 0x9C machine check. Once I reached the Windows logo, the only thing left was to add more Vcore.

Even if you can reach a multi of 47 at 1.3v does not mean you will necessarily be able to go higher.

Also, do tell us about what your power limits were set to. You should set them to 250.
Over at the Stable Sandy Club, we were having discussion about the Internal PLL Overvoltage.
And further testing, we found kind of weird thing about it.
Many say you need it to be on after 4.6 or 4.7 but I found that I do not need it until 5.2.
Up till 5.1, I can boot up fine without it. But It won't boot w/o it at 5.2.
Some reported that it is certain multiplier dependent. Means some people needs it at 5.2 but no need at 5.3. And needs it at 4.8 but not on 5.0, etc.
Very strange how this thing works...

Also VCCIO does affect the stability. Since it's the voltage for IMC.
If it's too low, the IMC will have problem keeping up with CPU/RAM.

VCCSA does not affect the OC. since it is just the system agent voltage.
Edited by Tunagoblin - 8/1/11 at 11:36am
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post #9 of 18
Quote:
Originally Posted by Strat79 View Post
I still don't think a very high percentage will go over 5.0 though. Not with air cooling anyway. I still bet 10% or less will hit 5.0+.
I'm pretty sure my temps at 5.0, if I tried to do it, would be very high with my sig rig. From 4.7 to 5.0 considering my chip and cooling solution... just doesn't provide enough benefit for it to seem worth it. I mean my temps would be legitimately high, definitely 85+ in Prime. I might not be damaging my chip necessarily, but all that heat pouring into my room, and noise from the fans just aren't worth the extra bump.

I feel 4.5ghz is the most balanced overclock, and I may stay there. It's reachable with average coolers, doesn't need much more voltage or massive trial and error with BIOS.

4.7+.... well, maybe in the winter when I want a space heater.
    
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post #10 of 18
Quote:
Originally Posted by Tunagoblin View Post
Also VCCIO does affect the stability. Since it's the voltage for IMC.
If it's too low, the IMC will have problem keeping up with CPU/RAM.
Well I know its for the IMC but it was my understanding that if you ran your RAM at spec then you really don't need to increase it the vast majority of the time (ie unless its a bad ram stick). If you overclock ram, yeah this would affect stability. Otherwise no, is that correct?

Also, I assume that the bsod would point to the ram if the IMC failed? if no, why not?

If there is no problem with the RAM, and your Vccio is sufficient to control the ram, then how would upping that voltage increase your cpu core stability?

tx

EDIT: Tuna, that's very interesting information about PLL Overvoltage. I tried to go up to 50x earlier today with that enabled (I needed it for 47x) and I got a 0x9C machine check, which is the same error I had gotten when I tried 47x with PLL disabled. Maybe I'll try disabling it again, man that is weird though.
    
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