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Why are the second gen i5/7 processors clocked so high?

post #1 of 12
Thread Starter 
I just got an i5 2500k and I was wondering why they clocked these things so high, 3.3-3.7Ghz?

is it because in comparison to others they need the extra speed, or was it because everyone was overclocking the previous generations so they decided to have them fast stock so they looked better on paper when people buy them?
Edited by Infinitegrim - 11/14/11 at 3:57pm
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post #2 of 12
when i asked Mr Intel he just said "cuz"
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post #3 of 12
Quote:
Originally Posted by Infinitegrim View Post

I just got an i5 2500k and I was wondering why they clocked these things so high, 3.3-3.7Ghz?
is it because in comparison to others they need the extra speed, or was it because everyone was overclocking the previous generations so they decided to have them fast stock so they looked better on paper when people buy them?

That's the standard clock nowadays. As technology has advanced, so has the normal stable stock clock speed. 5GHz+ is considered a "high" clock. Not anything in the 3s.
post #4 of 12
Thread Starter 
Quote:
Originally Posted by Shion314 View Post

That's the standard clock nowadays. As technology has advanced, so has the normal stable stock clock speed. 5GHz+ is considered a "high" clock. Not anything in the 3s.

I dont think that is necessarily true though. My P4 was 3Ghz. Then the Core 2 duo's and quads were slower
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post #5 of 12
The same reason Wolfdale was clocked higher than Conroe (I realize that was a tick to tock situation and this was a tock to tick, but it's still the same reason why). The TDP more allowed it.

No, they aren't slower clock for clock. They are faster clock for clock as well as being clocked higher.
post #6 of 12
Higher clock speed assuming the same IPC = more calculations done per second.
Therefore to make their processors faster and sell more chips, Intel will clock them as high as possible before manufacturing yields become a problem.
Considering just about every SB chip I've ever read of hits 4GHz+ like nothing I'd be guessing the only reason they're not clocked higher is to make introducing a better chip down the line a bit easier.
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post #7 of 12
I believe it's because of the refined manufacturing process which allows for higher clock speeds. If they know all non-defective chips can run that speed, they'll probably offer it since it's technically a new product for no real cost to them (ie: different models with only 100mhz increases in stock speeds).

It's not that they need it to be competitive, it just offers more value for the processor with no added cost to the manufacturer. They know every 32nm chip can run 3.6ghz, so they will offer one that runs that speed at stock for a nominal price.
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post #8 of 12
Technology advances.
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post #9 of 12

They're clocked higher, and have higher IPC than the first gen core i's, while using considerably less power.

 

Which is why it was such a good release.

 

Intel did a lot right with Sandy Bridge, from price, to performance, as well as overclock ceiling (on typical cooling), and power draw... They released a very refined chip that touched on every aspect of improvement.

    
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post #10 of 12
A lot of the answers in this thread are spot on. The answer to your question in a combination of them.

If you look at a processor, it can only do so many things in one clock cycle. A processor can't do tons of things at once while simultaneously having a fast clock speed. It is a trade off. If you do a lot at once, each cycle of the clock generates a lot of heat and limits the clock speed. If you don't do a lot at once, you can afford a high clock speed to compensate. The art in processor design is finding a sweet spot that maximizes performances. Also, every time you make transistors smaller, less heat is generated per clock cycle. That enables you to make a processor with more instructions per clock, higher clock speed, or a combination of the two.

The problem with high clock speeds (no matter the processor design) is that you run into physical limitations of silicon that complicate things. You need to pull out some neat tricks in both CPU design and silicon refining and construction to overcome these problems. This is why you don't see any processor with very low instructions per cycle and very high clock speeds.

On top of all this, you have to make money as a company. Picking a design that has a high fabrication success rate makes you more money!
    
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