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Silicon Chip 4GHz Limit

post #1 of 15
Thread Starter 
Hey,

I've been doing some research lately and I was wondering if anyone could point me to some good reading material relating to the 4GHz silicon chip limit.

I just heard about all of this recently and I was also wondering whether or not you're actually getting the frequency your computer tells you you're getting when you overclock beyond 4GHz (or at all for that matter).

Thanks in advance to replies!
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post #2 of 15
I have never even heard of this limit. Quite simply the speed is set. If the transistors are not switching fast enough or the electrons are not moving fast enough there will be serious problems.

5ghz is a reality on air for some people at this point.

There is a bit of a wall though and its not 4ghz. We will only get to so small of a process that can be done on silicon. There is also the .6v turn on voltage and intel is messing about with processors that operate that low. But we will get to an arch so small and so optimized and its only going to clock to a certain frequency say 5.5-6ghz without decent cooling. The voltage will be very limited around 1v anything higher on say 11nm is death without LN2.

Just on that i would say there is a valid limit we will eventually hit based on bottoming out on process size and maximum voltages on silicon.
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post #3 of 15
Thread Starter 
Well, I had an unfortunately brief conversation with a couple of engineers the other day... And they were talking about 4GHz being some kind of wall for silicon chips, which is one of the main reasons Intel and AMD stopped making single core chips. From what little I've found on the internet, the limit seems to have to do with the increases in heat vs. the gain in performance being increasingly lower when you attempt to clock chips higher.
When I pointed out that modern chips like the 2600K get well over 4GHz easily, they said that overclocking doesn't actually run your processor at the frequency it says it does.

They weren't very clear, but I've found some stuff on the internet that seems to verify this. It also explains why you never see any chips with 4GHz as their stock clock; we've been getting around the same frequency for a while now, but improvements in architecture (I guess) have allowed the chips to continue getting faster.

I'm pretty sure this isn't related to the limit ^ you ^ are talking about, but I could be wrong.

But I really don't know too much about this supposed limit, though it does appear to exist.
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post #4 of 15
Load of people especially on OCN have gone over 4GHz. Including myself.

EDIT: just look at my CPU-Z validation in my sig.
    
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post #5 of 15
Sounds like either the engineers had had a lobotomy or you didn't quite understand what they meant.
    
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post #6 of 15
Quote:
Originally Posted by btgrant View Post
Hey,

I've been doing some research lately and I was wondering if anyone could point me to some good reading material relating to the 4GHz silicon chip limit.

I just heard about all of this recently and I was also wondering whether or not you're actually getting the frequency your computer tells you you're getting when you overclock beyond 4GHz (or at all for that matter).

Thanks in advance to replies!
You do get performance after oc beyond 4Ghz .

set your cpu @ 4. run benchmarks .
and after set @ 4.5 , and run again .
Scores will improve .
I get 7.14 scores in cinebench @4.5Ghz .
and around 5 @ stock
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post #7 of 15
Guinness World Records for a silicon chip is 8.42ghz right now.

Link
http://thetagtech.com/?p=34817
Edited by dixson01974 - 10/23/11 at 2:18am
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post #8 of 15
Then why is there a Performance increase?
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post #9 of 15
Quote:
Originally Posted by btgrant View Post
Well, I had an unfortunately brief conversation with a couple of engineers the other day... And they were talking about 4GHz being some kind of wall for silicon chips, which is one of the main reasons Intel and AMD stopped making single core chips. From what little I've found on the internet, the limit seems to have to do with the increases in heat vs. the gain in performance being increasingly lower when you attempt to clock chips higher.
When I pointed out that modern chips like the 2600K get well over 4GHz easily, they said that overclocking doesn't actually run your processor at the frequency it says it does.

They weren't very clear, but I've found some stuff on the internet that seems to verify this. It also explains why you never see any chips with 4GHz as their stock clock; we've been getting around the same frequency for a while now, but improvements in architecture (I guess) have allowed the chips to continue getting faster.

I'm pretty sure this isn't related to the limit ^ you ^ are talking about, but I could be wrong.

But I really don't know too much about this supposed limit, though it does appear to exist.

you were right about one thing. Last time I checked Heat would be the reaons for that wall you are talking about. I don't remember the number but Its like 20 GHZ at its top, assuming the architecture Is Perfect and the problem of heat is non existant.

No w look this up ( I did a presentation on it many years ago);
Its one or the other but I remember either hearing that The Fastest possible we will ever Achieve is 50 GHz, because the speed of electricity in the circuits will be the new bottle neck.

Or That when processors ditch Silicone and go with Lazers ( the info in somewhere in the web) The Chips will be able to hit at least 40-50 GHz.

Now i may have some of this info all mixed up but You will probably find it now that i mentioned it. And no I am not making any of this up! If I ever find the paper i wrote i will type it all up! with works cited
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post #10 of 15
back in the days of Pentium 4, Intel was on this rabid quest for 4ghz. (and ultimately 10 if they stuck to their roadmap).

They were never able to make it past 3.8, due to the processes available at the time, heat, and power draw.

maybe that is what your friends are referring too.
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