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Does "offset" mode instead of "fixed" for overclocking Sandy Bridge Intel chips really help extend life?

post #1 of 9
Thread Starter 
I know the offset mode reduces the voltage when idling so not the same amount of current is running through the chip for 24/7 use like the fixed mode would give you.

It also makes overclocking a bit more tricky though.

Does it really extend the life of the CPU and do you guys think it is worth it? or is fixed mode the way to go?
post #2 of 9
I would get idle BSODs before I switched, thats the main reason I switched.
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post #3 of 9
Not sure if it helps but it seems like it would. I use offset exclusively on my comp. There are a few tricks to getting the higher OCs using offset. Like using high LLC instead of ultra high or higher to put your idle voltages a bit higher so you don't BSOD while idling or using programs that don't use much power. This thread is amazing for all sorts of info: http://www.overclock.net/t/1120291/solving-fixing-bsod-124-on-sandybridge-read-op-first/0_20

There's got to be a reason they implemented it. Not sure if it gives you that much more chip life though.
Edited by discipline - 3/25/12 at 6:49am
post #4 of 9
Don't worry about lifespan of modern CPUs. You won't reach it. Unless you overclock it too much.
But offset mode helps save you money on power costs.
    
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post #5 of 9
I just recently started using ofset mode on my SB-E. Its nice to be able to enable Intel's power saving C-States/SpeedStep, which is what Offset optimizes your vcore towards. It scales the vcore with the speed of your CPU as it runs through those power saving steps. I'm still testing, but I haven't had any issues over the past few days. I recommend at least giving it a try and see if you have any issues.
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post #6 of 9
Quote:
Originally Posted by j0zef View Post

Don't worry about lifespan of modern CPUs. You won't reach it. Unless you overclock it too much.
But offset mode helps save you money on power costs.

That's sorta the point though. I use offset so I'm not always running a high voltage through my chip nonstop. The majority of my pc when I'm not gaming is spend doing menial stuff like web browsing or just in idle mode. I'd much rather it run at 0.98mv for all that and ramp it up when gaming/needed as opposed to 1.40mv on a 24/7 basis.
post #7 of 9
Thread Starter 
Hmmm..I was going to say, because using the offset mode is more complicated to overclock.

Because you can't outright "pick" your voltage you have to set the "offset" votlage.

And at higher overclocks, like 4.0ghz +, my CPU voltage easily exceeds 1.3+++, EASILY.

So I have to estimate a negative OFFSET of like 0.100 or something just to keep it at 1.3 instead of the 1.4 or 1.5 which is way too high.

It's a guessing game.

I'm using the fixed mode right now, and so far I can do 3.8ghz at 1.100volts. I tried 4.0ghz at 1.100 volts but crashed.

So fixed is wayyy easier to overclock since the voltage isn't fluctuating and it is less of an approximation than offset. If I can keep a low overclock like this with low voltage, I may just stick with fixed.

I plan for something around 4.0ghz or so, around 1.2v max, for a 24/7 use, so I would imagine fixed for that isn't that bad.
post #8 of 9
I like the offset mode, under load in a 4.6ghz prime stable OC, I'm getting anywhere between 1.296v to 1.312 (in IBT mostly), most of the time it's 1.304v, those are the highest numbers so far, I did a 4.5 ghz that would peak at 1.288v.
Good thing is that when the cpu is lowered to 1.2ghz, my vcore drops to 0.886 or so.
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post #9 of 9
Quote:
Originally Posted by XxAlbertoxX View Post

I know the offset mode reduces the voltage when idling so not the same amount of current is running through the chip for 24/7 use like the fixed mode would give you.
It also makes overclocking a bit more tricky though.
Does it really extend the life of the CPU and do you guys think it is worth it? or is fixed mode the way to go?

Anything that reduces the temperature or current in the chip will extend its lifetime. Electromigration is always occurring, but its rate is determined by the current density and the temperature - the former quadratically and the latter exponentially,
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