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Sandy Bridge, "high" overclocks with offset?

post #1 of 10
Thread Starter 
Is it possible to overclock on Sandy Bridge on Asus p8p67 using offset when the voltage is automatically set way beyond what you know is necessary for those frequencies?

For example, I'm on the p8p67 PRO and attempt to overclock my 2500k with offset. I just go into bios and select offset voltage and turn the multiplier up to 46x. I know that I can run 46x multi stable at 1.29v from experimenting with fixed voltage overclocks. This is holding all other settings the same as in my non-offset OC (except the C-states and such).

However, when I boot the BIOS has automatically set the voltage to 1.464ish volts. So in order to get the offset down to what I know it is stable at I'd have to reduce it by such a large amount that the idle voltage would most likely no longer be stable (at 16x multi).

Is there any way around this other than not using offset or ridiculous overvolting?

Thanks in advance.
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post #2 of 10
I could tell you everything, but all the info you need is already posted here. If you have anymore questions, you could post them in the club(don't forget to join) and it will be answered by a member, or myself.
Edited by nawon72 - 6/19/11 at 12:39pm
post #3 of 10
Try bringing LLC down a notch or two. I'm using ultra high with a +0.02v offset for 4.8GHz.
    
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post #4 of 10
Quote:
Originally Posted by nawon72 View Post
I could tell you everything, but all the info you need is already posted here. If you have anymore questions, you could post them in the club(don't forget to join) and it will be answered by a member, or myself.
I'm confused as to how that answered his question? Like in what I'm reading there for a 45x multi it gives a vcore of 1.3410v. He only needs 1.29v to be stable on a 46x multi. So it basically makes it impossible to overclock efficiently with the offset if you have a CPU that overclocks well. If it needs a lot of voltage then it's better.
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post #5 of 10
Quote:
Originally Posted by nawon72 View Post
I could tell you everything, but all the info you need is already posted here. If you have anymore questions, you could post them in the club(don't forget to join) and it will be answered by a member, or myself.
ok this dude obviously doesn't know what the heck he's talking about..you absolutely don't want LLC at ultra high under offset mode for this frequency,

Quote:
Originally Posted by Dopamin3 View Post
I'm confused as to how that answered his question? Like in what I'm reading there for a 45x multi it gives a vcore of 1.3410v. He only needs 1.29v to be stable on a 46x multi. So it basically makes it impossible to overclock efficiently with the offset if you have a CPU that overclocks well. If it needs a lot of voltage then it's better.
no you can overclock very well under offset mode and it is very efficient
    
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post #6 of 10
Quote:
Originally Posted by Dopamin3 View Post
I'm confused as to how that answered his question? Like in what I'm reading there for a 45x multi it gives a vcore of 1.3410v. He only needs 1.29v to be stable on a 46x multi. So it basically makes it impossible to overclock efficiently with the offset if you have a CPU that overclocks well. If it needs a lot of voltage then it's better.
You can lower the Vcore with offset. Just change Offset Mode Sign from + to -
post #7 of 10
Quote:
Originally Posted by nawon72 View Post
You can lower the Vcore with offset. Just change Offset Mode Sign from + to -
But then wouldn't the idle voltage drop significantly? Like if he set it to - 0.2v to stabilize 4.6ghz, which let's say yielded 1.29v on a 46x multi, then wouldn't the idle voltage drop too low causing it to be unstable?
Edited by Dopamin3 - 6/19/11 at 6:58pm
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post #8 of 10
Thread Starter 
I already know about using the sign change in the offset. And if you already know how to overclock efficiently mind shedding some light on how to do it?

Like it has been mentioned earlier I don't want to overvolt by that much. I know can push 1.29 stable so why would I let the offset run it at 1.34ish?

Also according to this post on how the OCing through offset is done( I know its not the same board but I assume its the same principles):
http://www.asusrog.com/forums/showth...-Core-Voltage&

If you use the sign for - to reduce the load VID, the idle VID also gets reduced. Now my 1.6Ghz idle VID is about 1.000v, and I've seen it go down to about 0.984v. When I set offset to correspond to 46x multi, the p8p67 BIOS sets my voltage to 1.464v. To get that down to 1.29v I would need to set the - sign offset value to 0.174.

This means my idle VID would be dropped to roughly 0.826v as a high estimate. Is this assumption correct?

I haven't actually tried it because somehow I doubt my idle VID would be stable with those volts, or would it?

I mean that value might be stable but say I wanted to achieve another higher 4.8+ Ghz overclock, wouldn't my idle VID drop even lower?

Are you guys seeing the problem I'm getting at?

Any info. on how this works is greatly appreciated, thanks.
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post #9 of 10
Quote:
Originally Posted by cmeeks View Post
Try bringing LLC down a notch or two. I'm using ultra high with a +0.02v offset for 4.8GHz.
What LLC are you using?
Quote:
Originally Posted by coolhandluke41 View Post
ok this dude obviously doesn't know what the heck he's talking about..you absolutely don't want LLC at ultra high under offset mode for this frequency
I wasn't necessarily suggesting ultra high. However, he could have LLC set to extreme for all I know! I only mentioned my settings so he would have a reference of approximately how much offset it takes for the ultra high setting. Knowing that, I'm willing to bet it takes about +0.06v for LLC set to high to get the same load voltage.

Don't be such a tool. You quoted the wrong post in your haste to bash and you didn't even offer any constructive advice in the process.
Edited by cmeeks - 6/19/11 at 9:01pm
    
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post #10 of 10
I have to agree with the LLC. It seems to really add a lot of vcore beyond what the offset should specify. Im running 4.7 with a +.020 offset and ultra high LLC (75%) on my 24/7 daily driver. My chip can definitely take more, but the H60 just isnt up to the cooling requirements.
    
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