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post #71 of 127
as temp drops, more voltage is safe.

this is why at -70C you can run 1.7v and have it run fine for hours and hours with zero degredation.

as the chip gets hotter, the resistance becomes greater, and with lots of vcore at high temps, what kills a chip is electron migration, also known as high energy electrons jumping traces to lower energy traces, killing your chip.

so in theory, if you keep your chip at a constant 20C, ahigher voltage will be safe witout degradation to the silicon than if the chip were loading at 80 or 90C.

lets not also forget, that intel has a linear equation in their spec sheets that shows how as amperage increases, "safe" vcore decreases. its linear so shouldnt be too hard to figure out given the equation.

its all relative my friends.
Edited by wumpus - 1/10/11 at 10:50pm
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post #72 of 127
Quote:
lets not also forget, that intel has a linear equation in their spec sheets that shows how as amperage increases, "safe" vcore decreases. its linear so shouldnt be too hard to figure out given the equation.

its all relative my friends.

So can you interpret the sheet for me, I'm terrible at math?
    
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post #73 of 127
http://www.anandtech.com/show/2468/6

http://en.wikipedia.org/wiki/MOSFET#Difficulties_arising_due_to_MOSFET_size_reduction

As you steal the nanometers, heat will be greater at the same voltages as previous generations.

Quote from the article:

"Because end of life failures are usually caused by a loss of positive voltage margin (excessive wear/degradation) we can establish a very real correlation between the increased/decreased probability of these types of failures and the operating environment experienced by the processor(s) in question. Here we see the effect a harsher operating environment has on observed failure rate due to the new end of life failure rate curve. By running the CPU outside of prescribed operating limits, we are no longer able to positively attribute any failure near the end of warranty to any known cause. Furthermore, because Intel is unable to make a distinction in failure type for each individual case of warranty failure when overclocking or improper use is suspected, policy is established which prohibits overclocking of any kind if warranty coverage is desired."

As heat is increased, the CPUs life is shortened. Your Sandy Bridge CPU is hotter due to the 32nm process. Don't run your CPU over Tcase all day and you'll be fine. That is all.
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post #74 of 127
How do we measure Tcase?

I believe it's 73.6C

Can you use realtemps core temps for Tcase?
    
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post #75 of 127
Quote:
Originally Posted by Jonesey I7;11967359 
So can you interpret the sheet for me, I'm terrible at math?

everyone takes algebra in highschool, thats all it is.

plug in amperage for the X value and get out voltage for the Y value.

its in the slope-intercept form, Y=MX + b where M is slope and b is the Y intercept.

simple really. although you need to somehow find out the amperage that your CPU is really drawing, which can be done if you finout how many watts are being pulled though the EPS12v connector and then I think divide by voltage. dont quote me on that though.
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post #76 of 127
Quote:
Originally Posted by BallaTheFeared;11967392 
How do we measure Tcase?

I believe it's 73.6C

Can you use realtemps core temps for Tcase?

You have to drill down the middle of the IHS to read Tcase.
post #77 of 127
Well then, thats pretty much worthless frown.gif

Is there anything on Tcase vs Core Temp that we could use to figure out which reading would be either higher or lower...

Say your Core Temp was 65C then your Tcase would be 70C, or the opposite, anything like that?

Throw me a bone...

I have sub 0C water in my loop, so my only concern will be temps.
    
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post #78 of 127
Quote:
Originally Posted by Porter_;11967068 
you may already know this, but the QVL printed in your manual differs from the QVL listed on their site (with a rev date of 12/29/10). the one on the website obviously supersedes the manuals, but at the very least it gives you an indication that they are still in the process of revising the QVL. in my case, my ram has actually been *added* to the list since the manuals were printed...so they're not just striking ram off the list. i'll be keeping a lookout for the next revision to see if my ram gets taken back off. not likely, but i'll still keep up with it.

Yes, I know it supersedes the manual. The QVL I first looked at was the one from the Asus website and not from the manual. Though both still list Mushkin Redline DDR3 1600Mhz 6-8-6-24 996805 Kit as compatible. But if doesn't work then I'll just send it back for some G. Skills but I kind of doubt why it wouldn't work. Haven't heard of anyone that can't run it yet except for some people on old AMD systems on NewEgg. They were trying to use some ram sticks made specifically for P55 chipset and it didn't work (must have had special code or profile programmed into it). I think someone else got the same board and set of ram as I did too. If they had a problem they'd probably report it by now. I just don't have my CPU yet to test anything.
Quote:
Originally Posted by Bal3Wolf;11967078 
volts kill we are talking about computers not a ac circuit.

Relax, it was an engineering joke. laugher.gif Why so serious? thinking.gif You must not be an engineer. But voltage exists in DC and AC circuits. It's just that it will take a lot of voltage to kill your processor. If you use a megger and pump it up to 500v and attach it to your motherboard it'll blow out all your capacitors. But seeing that ES Gulftown at 1.9v is pretty impressive.
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post #79 of 127
Yes you can run high volts what i thk the guy is trying to get across is long term not a few hrs benching i had my i7 at 1.65 volts for a few hrs to benchmark.
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post #80 of 127
like i previously mentioned there is no specific safe voltage, unless you count voltage that is safe at the sustained TJmax temp of the chip which I would think is very surprisingly low.
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