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Complete Overclocking Guide: Sandy Bridge & Ivy Bridge | *ASRock Edition* - Page 42

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post #411 of 9531
Hey folks, last time I posted, had this 2700k at 45 stable, I installed an H80, went to 46x offset 0.070, p95 stable (4 hr) and have been using it without issues for a week. Tried just 47x with offset of +0.080, LLC2, and PPL disabled. BSOD 124 quickly in p95 . Turned PPL on and running P95 blend ... Looks good so far after 1h 20m. Bios Vcore 1.328-1.336, cpuz core voltage while running p95 is 1.296-1.312-1.320V. VID=1.3561. P95 Max temps=65/73/69/66 with the H80 on "balanced". I still don't understand why this is stable at all when the vid is so much higher than the core volts reported in CPUz... Help!

So what's the magic with PPL OV? What does it do? And is it better/safer with it off? And a lower clock of course.
JPM
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post #412 of 9531
Thread Starter 
Quote:
Originally Posted by Jpmboy View Post

Hey folks, last time I posted, had this 2700k at 45 stable, I installed an H80, went to 46x offset 0.070, p95 stable (4 hr) and have been using it without issues for a week. Tried just 47x with offset of +0.080, LLC2, and PPL disabled. BSOD 124 quickly in p95 . Turned PPL on and running P95 blend ... Looks good so far after 1h 20m. Bios Vcore 1.328-1.336, cpuz core voltage while running p95 is 1.296-1.312-1.320V. VID=1.3561. P95 Max temps=65/73/69/66 with the H80 on "balanced". I still don't understand why this is stable at all when the vid is so much higher than the core volts reported in CPUz... Help!

So what's the magic with PPL OV? What does it do? And is it better/safer with it off? And a lower clock of course.
JPM
Quote:
PLL overvoltage has something to do with skew of the pll voltage. You should ask Sin on XS or OCN about it. He said something like PLL overvoltage allows 500mv of the PLL voltage into the pll area, while usually it's 350mv.

It basically lets your PLL Voltage fluctuate to higher standards than normally set (And is independent of CPU PLL Voltage).

It is almost always (97%) needed for any really high overclock, which on sandy bridge is anything 4.7GHz+.

I haven't seen a single person yet that has experienced problems with it on (damage wise). But like my guide says, it can cause Sleep problems on some motherboards like mine. So I chose to just downclock to 4.5GHz w/o it so I could Sleep and save power.
post #413 of 9531
Eh, bsod124 after approx 1h30min! Will see if I can sort this out. Is 124 a PPL or Vcore thing? Or both?
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post #414 of 9531
Thread Starter 
Quote:
Originally Posted by Jpmboy View Post

Eh, bsod124 after approx 1h30min! Will see if I can sort this out. Is 124 a PPL or Vcore thing? Or both?

94% likely its Vcore.

5% chance its QPI/VTT.

1% chance its CPU PLL (no such thing as PPL).

PLL Overvoltage should be on anything past 4.6GHz.
Edited by kennyparker1337 - 4/22/12 at 3:27pm
post #415 of 9531
Quote:
Originally Posted by kennyparker1337 View Post

It's more of a hardware limitation. The memory controller and iGPU, among other important hardware things, are now integrated and/or controlled/influenced directly by the CPU itself. So Sandy Bridge (and I'm assuming other new architectures) doesn't have a FSB like you might think. Instead of a FSB it has a BCLK or Base Clock setting. When you increase the BCLK you also increase the speed of the dependent hardware. While things like the iGPU might just "not work" if overclocked to much, items like the memory controller do NOT like to be sped up. A certain point ~107+ BLCK it gets so out of range that things just start to fail, bits begin to error, and can even cause a Windows 7 to corrupt!
In short, its not a limitation Intel put on it, but merely a consequence (or adaptation as I think of it) of a new architecture. thumb.gif
It's amazing how you can take away a complete overclocking feature (FSB) and still get MUCH higher speeds by just using the multiplier!

My Lynfield i7 system also uses BLCK rather than the older FSB, but you bump up your BLCK to OC your system. It also bumps up your memory speed, and you make adjustments with memory controller settings and/or purchase memory that can handle that speed. So none of this is new.

As far as BLCK also increasing the speed of dependent hardware, well, that's not a new issue either, and has been addressed in the past. . As I noted in my previous post, Via chipsets did not lock the AGP and PCI buses which limited OCing Via chipsets. That's why they were not that popular among overclockers and some have suggested it led to their demise as a chipset used on enthusiast motherboards. But other chipsets like Nvidia chipsets and Intel chipsets as well locked those buses so that the hardware attached to those buses were not affected. It let on really fiddle with the FSB, or more recently, the BLCK. I think the default BLCK on my Lynfield system is 1333, and I'm running at 1640. The attached hardware is doing just fine, for two years now.

I mean, really, OCing used to be all about increaing FSB, or more recently, BLCK. Overclock.net old-timers obviously know this. But with SB, that's not how you OC. It all seems to be via multiplier. What is new, as you pointed out, is the built-in video within the chip. Perhaps that's the game-changer, that ramping up the BLCK could cause video problems.

My last system was my Lynfield system, I built that about two years ago. To be honest, I had lost interest in building systems, too busy with work-related matters. So I have learned a lot with this build, really enjoyed it. And it seems that SB chips and subsequent chips like IB are a very different animal, and that now only certain chips can be OCed, not others. So I guess if you have an i3 chip, your OC options are nil. Interesting. All that said, it's still apparent that motherboards can still have a significant impact on OCing.

marty
Edited by tootercomputer - 4/22/12 at 4:02pm
post #416 of 9531
Right. PLL ! I'll try another+ 0.005v in the offset first. Then the lower odds possibilities. In your opinion, is an offset this high 0.085-0.090, getting too high? I recall seeing some on OCN up in the 0.100 range.
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post #417 of 9531
Thread Starter 
Quote:
Originally Posted by Jpmboy View Post

Right. PLL ! I'll try another+ 0.005v in the offset first. Then the lower odds possibilities. In your opinion, is an offset this high 0.085-0.090, getting too high? I recall seeing some on OCN up in the 0.100 range.

Go by the voltage you see in Windows. Don't go any higher than 1.52v as noted in the guide.
post #418 of 9531
Thanks Kenny. I raised the offset to +0.085v, iPLL OV -enabled, CPU PLL auto, LLC 2, bios Vcore=1.336-1.344, cpuz: idle 1.064, vid=1.3561. P95 blend: cpuz=1.312-1.328 (floats). 1:23h into blend all looks good so far. Temps (H80 at balanced) 68/76/72/69 oC, ambient = 24oC. 47 multiplier looking good. I think these max temps are reasonable for this OC. Agree?

Vcore as you said!
JPM
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post #419 of 9531
Quote:
Originally Posted by kennyparker1337 View Post

Go by the voltage you see in Windows. Don't go any higher than 1.52v as noted in the guide.

I've seen this statement made several times in this thread but I don't know what you mean by "voltage you see in windows"

Do you mean in CPU-Z? At stock settings. Or what?

Maybe it's in this thread somewhere and I missed it.

Could you explain please?
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post #420 of 9531
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Quote:
Originally Posted by Jpmboy View Post

Thanks Kenny. I raised the offset to +0.085v, iPLL OV -enabled, CPU PLL auto, LLC 2, bios Vcore=1.336-1.344, cpuz: idle 1.064, vid=1.3561. P95 blend: cpuz=1.312-1.328 (floats). 1:23h into blend all looks good so far. Temps (H80 at balanced) 68/76/72/69 oC, ambient = 24oC. 47 multiplier looking good. I think these max temps are reasonable for this OC. Agree?

Vcore as you said!
JPM

If I were you, I would try and get 5GHz tongue.gif but yes that is great.
Quote:
Originally Posted by Turtley View Post

Quote:
Originally Posted by kennyparker1337 View Post

Go by the voltage you see in Windows. Don't go any higher than 1.52v as noted in the guide.

I've seen this statement made several times in this thread but I don't know what you mean by "voltage you see in windows"

Do you mean in CPU-Z? At stock settings. Or what?

Maybe it's in this thread somewhere and I missed it.

Could you explain please?

The voltage reported by CPU-Z during a load test (like Prime95).
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