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Why do intel chips vary in performance??? - Page 3

post #21 of 30
Quote:
Originally Posted by anthony92 View Post
taken from link above.

why does purer silicone oc higher?

Edit: also if they do limit the chip artificially, shouldnt all chips in the same range say 950 have the exact same oc.
You're asking a question that takes about year of microelectronics courses to truely grasp.
But simply put, the better quality waffers have properties that allow for less heat dissipation due to a variety of factors. In turn this allows the chipset manufactured based on higher grade material to perform better, i.e. allow acceptable operating temperatures when higher voltages are applied.
post #22 of 30
http://en.wikipedia.org/wiki/Standard_deviation

Apply that concept to Intel's manufacturing process. Intel's goal is to have the chips all within their specifications for chips. That is why your VID can range so greatly, and why your oc capability is different chip to chip. It is possible that not all chips are going to meet the specifications for the 950, those chips might however meet the specs for a 860.
    
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post #23 of 30
Quote:
Originally Posted by markag View Post
No two components are exactly the same. Even if they have the same model number and are made up of the same parts. They are not really the same. The difference comes in unavoidable impefections in the materials and parts and manufacturing. Intel or any other company does what they can to control the imperfections, but it is impossible to completely remove all imperfections. That is why there is still an accepted range or tolerance to determine a "good" part. Even though two 950s are designed the same, and manufactured to be the same, they aren't going to be identical carbon copies of each other. One will overclock higher then the other because of differences in the quality of all the components.
That's because CPUs are made out of silicon nor carbon.
post #24 of 30
a perfect chip (low leakage) does not overclock well but will run really cool, these normally have a vid in the rande of 1.25V-1.3V.
lowend chips (high leakage) can withstand higher voltage and will overclock higher, but will also run alot hotter then the low leakage chip, normally have a really low vid like .9V-1.2V.
Edited by redhat_ownage - 3/8/11 at 2:51pm
post #25 of 30
Two questions, which can hopefully be answered in dumb person language, because I'm not an electrical engineer.:

1. Why would a chip with lower leakage have a higher VID? It would seem that more leakage would need more voltage.

2. Why do higher leakage chips OC better?
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post #26 of 30
We learned a bit about this in computing class last year, and basically, when chips are produced and tested, they're "binned" based on their performance abilities. Those that can reach higher speeds are marketed as more expensive models, and those that can't are sold off cheaper.
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post #27 of 30
Quote:
Originally Posted by AyeYo View Post
Two questions, which can hopefully be answered in dumb person language, because I'm not an electrical engineer.:

1. Why would a chip with lower leakage have a higher VID? It would seem that more leakage would need more voltage.

2. Why do higher leakage chips OC better?
1. they usually dont, but its not about the stability of the chip its about the heat output.

2. high leakage chips can withstand higher voltages due to them leaking voltage, when you cool then down enough (watercooling, phase) they overclock really well, because that voltage leak is kept in check by cold temps.
at the same time that chip on air will be really bad do to it heat output at higher voltage.
post #28 of 30
Quote:
Originally Posted by AyeYo View Post
Two questions, which can hopefully be answered in dumb person language, because I'm not an electrical engineer.:

1. Why would a chip with lower leakage have a higher VID? It would seem that more leakage would need more voltage.

2. Why do higher leakage chips OC better?
I'm not an electrical engineer either, but the best I can figure is that it has to do with the random variation in source->drain resistance. Less resistance in this respect means that more current gets through, even when you don't want it to, but it also means that you can drain the transistor faster, causing it to switch faster.

The lower source->drain resistance also implies a lower voltage requirement.

http://www.extremetech.com/article2/...1860883,00.asp

Quote:
Originally Posted by redhat_ownage View Post
1. they usually dont, but its not about the stability of the chip its about the heat output.
Cooler running chips of the same line often do have higher VID.
Edited by Blameless - 3/8/11 at 3:55pm
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post #29 of 30
Interesting. +rep to you guys
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post #30 of 30
Very interesting. These cool running/non leaky chips, are they then more susceptible to damage from too much vcore?

It seems odd that they are either low vid or low temp when I always associated more vcore with more heat.
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