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Complete Overclocking Guide: Sandy Bridge & Ivy Bridge | *ASRock Edition* - Page 756

Poll Results: Was this guide helpful?

Poll expired: Oct 17, 2012  
  • 80% (237)
    Yes (and I DO have an ASRock motherboard).
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post #7551 of 9531
yes, in fact i mentioned this a couple posts back that leaving Turbo voltage at Auto makes the voltage swing at +/- .016v, you HAVE TO change it to manual in conjunction with regular Vcore offset. then the swing becomes only +/- .008.
post #7552 of 9531
Hey all, new issue. I recently changed something to my OC and all hell broke loose on my ASrock Pro SE 3.

First and for most, it won't allow me raise all cores above 38, I'll enter 40, press enter and it reverts back to 38. Further more, even when left at 38, when tested with Prime, the most all I will get is 35. Similar things occur with other settings sust as duration settings and plane current settings?

Should I reset my BIOS completely?

[edit]

Also, my RAM isn't being recognized, only 2 (of 4) at ever one time. I have tested each slot individually, combinations of 2, but when I put in all 4, it only recognized 2 mad.gif I'm starting to think that I've half killed my mobo
Edited by nooboc2012 - 12/12/13 at 9:45pm
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post #7553 of 9531
I guess it could be the motherboard's fault for the Vcore difference. Cause cpu auto volt at stock voltage to like 1.25V at max load. It was running pretty warm when I use prime95 for 12 hours. So I decided to undervolt it.

I just randomly pick an offset number of -0.2V. The idle voltage dropped to 0.9 and the max load dropped to 1.05V. It is running as stable as the stock setting on prime95 and ITB max setting. So I don't understand what's the point of extra 0.2V when the chip doesn't even need it. Now it's running almost 20C cooler on max load..
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post #7554 of 9531
I'm just getting into overclocking, and so far, this guide has been great, so thanks. I do have a few questions related to the process as a whole.

So as I understand it, the two limiting factors in overclocking are max Vcore, and max Temp. As long as the overclock is stable, and with in those two maximums, I'm good. Toward that goal, I'm trying to understand how I control Vcore.

I know Vcore = VID + offset + vdroop +(at load)turbo. Just FYI, I've got the recommended 0.005 offset and 0.004 turbo.

VID is set by Intel, so it's constant.

vdroop occurs under load, and LLC compensates. Is vdroop constant?

offset is set by me.

tubro is also set by me.

If vdroop and VID are constant and offset and turbo are controlled, then my Vcore should remain controlled as well, ie, has a max that cannot be broken unless I change the offset or turbo. Is what I've said so far true?

Next, I have my cpu ratio, which is actually what I'm trying to raise. Assuming I keep a constant Vcore as described before (via a set offset and turbo), as I raise my ratio, 39, 40, 41+, I'll hit a point where I'm not providing enough voltage to keep the CPU happy, and I'll get stability issues. At that point, to go to a higher cpu ratio, I need to raise my turbo (which in turn raises my Vcore max). Up and up I go until I hit either the Intel voltage or temperature max, and that's my max possible overclock. Am I understanding the process properly?
post #7555 of 9531
Don't worry about VID, its really not that useful. Only thing you need to pay attention to is what vcore is displayed in CPU-Z.

Increasing the multiplier one multiplier at a time is an extremely safe way to OC but it will also take a lot more time to get to your desired OC. Most of these chips will do a 44 or 45 multi with out much trouble so i would start there.

Set the multi at 44 or 45 with a +0.005 offset and a +0.004 turbo. Then post back here with your Idle and Full load vcore that's displayed in CPU-z.
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post #7556 of 9531
Quote:
Originally Posted by Lucky 23 View Post

Don't worry about VID, its really not that useful. Only thing you need to pay attention to is what vcore is displayed in CPU-Z.

Increasing the multiplier one multiplier at a time is an extremely safe way to OC but it will also take a lot more time to get to your desired OC. Most of these chips will do a 44 or 45 multi with out much trouble so i would start there.

Set the multi at 44 or 45 with a +0.005 offset and a +0.004 turbo. Then post back here with your Idle and Full load vcore that's displayed in CPU-z.

Thanks for the reply, and I understand that Vcore is the master measurement, but what I'm curious to know is how Vcore chooses and maintains a particular value. It's never really explained, so I'm trying to get a clear image of what my PC is doing under the hood. Specifically, does Vcore have a high end (a ceiling) that I'm setting via LLC, offset, and turbo?

I'm interested because I have a z77 Extreme6, and I know it doesn't report Vcore correctly. However, if I know Vcore can't swing to some crazy value because I'm controlling it, then it's not really a big deal that it's reported incorrectly. Basically, if I control the ceiling, I don't have anything to worry about for an everyday 4.4/4.5 GHz OC.
post #7557 of 9531
Quote:
Originally Posted by Lawngahnome View Post

Thanks for the reply, and I understand that Vcore is the master measurement, but what I'm curious to know is how Vcore chooses and maintains a particular value. It's never really explained, so I'm trying to get a clear image of what my PC is doing under the hood. Specifically, does Vcore have a high end (a ceiling) that I'm setting via LLC, offset, and turbo?

I'm interested because I have a z77 Extreme6, and I know it doesn't report Vcore correctly. However, if I know Vcore can't swing to some crazy value because I'm controlling it, then it's not really a big deal that it's reported incorrectly. Basically, if I control the ceiling, I don't have anything to worry about for an everyday 4.4/4.5 GHz OC.

Well unfortunately with your board, what CPU-z or bios reads is inaccurate. Its going to be hard to determine the exact vcore that is being supplied to your chip without using a multimeter.
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post #7558 of 9531
Quote:
Originally Posted by Lucky 23 View Post

Well unfortunately with your board, what CPU-z or bios reads is inaccurate. Its going to be hard to determine the exact vcore that is being supplied to your chip without using a multimeter.

Right, I can't see the real Vcore, which is why I want to know to what degree I can control it. On my chip and my board, if I set an offset, LLC level, and turbo, will Vcore always have the same max value?

Just as an example, I'm making up some numbers. I OC to 4.4 with .005 offset, lvl 2 LLC, and .004 turbo, then (with a DMM) measure the Vcore to be 1.35 under full load, can I be sure that my pc will always cap at that 1.35 with those settings?
post #7559 of 9531
Quote:
Originally Posted by Lawngahnome View Post

Thanks for the reply, and I understand that Vcore is the master measurement, but what I'm curious to know is how Vcore chooses and maintains a particular value. It's never really explained, so I'm trying to get a clear image of what my PC is doing under the hood. Specifically, does Vcore have a high end (a ceiling) that I'm setting via LLC, offset, and turbo?

I'm interested because I have a z77 Extreme6, and I know it doesn't report Vcore correctly. However, if I know Vcore can't swing to some crazy value because I'm controlling it, then it's not really a big deal that it's reported incorrectly. Basically, if I control the ceiling, I don't have anything to worry about for an everyday 4.4/4.5 GHz OC.

to answer your question, there's really no ceiling control for the vcore. in the old days, Vcore was hard set by the manufacturer on every chip, and it used to be the same value for every chip in the same class. now with the newer generation of chips like sandy, ivy, and haswel, to my best knowledge it functions by utilizing a feature called SVID. which requests for an arbitrary vcore value from the motherboard based on how much IT THINKS the core needs at certain speed. this is why some people's stock voltage is higher than others. my last Ivy chip stock voltage was 1.2V, and this one only runs less than 1.1 at stock speed, which was auto set by the SVID. think of it as a onboard voltage computer that somehow knows how much voltage itself needs to run.

if you're concerned about not blowing up your chip, which from what you're describing sounds like that's what you're trying to accomplish. Since there's no ceiling feature that's linked to the Vcore, what you can do instead is assigning a power ceiling to your CPU, so that it won't exceed that maximum power ceiling. since intel Spec on Ivy is 77watt, and a heavily overclocked chip goes up to 150~165watt at 5ghz, you can always set a power ceiling somewhere in between. again, that doesn't directly affect the vcore value, what it does is it throttles down the speed when the total CPU power reaches the power ceiling you set it to.

hope this helps.
post #7560 of 9531
Quote:
Originally Posted by Lawngahnome View Post

Right, I can't see the real Vcore, which is why I want to know to what degree I can control it. On my chip and my board, if I set an offset, LLC level, and turbo, will Vcore always have the same max value?

Just as an example, I'm making up some numbers. I OC to 4.4 with .005 offset, lvl 2 LLC, and .004 turbo, then (with a DMM) measure the Vcore to be 1.35 under full load, can I be sure that my pc will always cap at that 1.35 with those settings?

it doesn't work like that. SVID is not constant. it's an auto sensing voltage requirement based on "load". think of it like a car's fuel pump. the amount of fuel pumped out is based on RPM and Air/Fuel sensor. so the pump will increase based proportionally based on the load that's demanded by the engine. 1.35v is the total maximum that your chip seems to be running, after factoring in the offset + SVID base Voltage.

your maximum vcore value at load will be roughly .07volt higher than 1.35v due to the fact that these Asrock Z77 boards roughly overvolts by about .05~.07v. it CAN be even higher than that depending on the kind of load you put on the chip. i think in one testing, one user even saw it overvolt by .1v in extreme cases. but 99% of the time, during load, your vcore value roughly will be 1.42v if you were to read it by using a multimeter.

honestly, if i were you, i wouldn't worry about it. Intel's maximum recommended voltage is 1.52v for an ivy. provided if your load temperature is reasonable, and you're below that 1.52v mark, you're more likely to see your RAM fail, or your HDD to go before the CPU kicks the bucket.

i've been overclocking for the past 15 years, and fried a couple chips in my life. my last Q6600 ran for 5 years at 1.5v at 4ghz and i saw two sets of ram died due to IC degradation, and replaced 2 HDDs due to HDD deaths. the CPU was still kicking strong. intel's maximum recommended voltage for the Q6600 was 1.5v, i was practically living on the edge.
Edited by howzz1854 - 12/17/13 at 9:11pm
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