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Does performance directly scale with clock rate?

post #1 of 9
Thread Starter 
I know that obviously since CPUs have different architectures clock rate alone is meaningless in comparing 2. However, for example on one chip running at 1GHz. If that chip was then overclocked to 2 GHz, would it result in a 100% performance increase? Or does it not work like that?
post #2 of 9
Doesn't work like that....
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post #3 of 9
Diminishing returns won't let it be an %100 performance increase, meaning the higher you go the less you gain. Not saying that higher isn't better it just isn't as good up to a point.

Thats why we they started making multi-core CPUs over high clocked single core CPUs.
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post #4 of 9
Yes and no... Yes it relates to performance BUT you wont see a 100% increase...
EDIT: YAY 300th post
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by Bobicon View Post
Diminishing returns won't let it be an %100 performance increase, meaning the higher you go the less you gain. Not saying that higher isn't better it just isn't as good up to a point.

Thats why we they started making multi-core CPUs over high clocked single core CPUs.
Makes sense. I thought that was also due to the fact that high clock rates generate insane amounts of heat though.
post #6 of 9
I think it depends on what the bottleneck in the system is. If the CPU was the bottleneck at 1ghz and wasnt at 2ghz, then a performance increase would be realized, but it wouldnt be a 100% gain. If that were the case, 5ghz SB processors would be a ton faster than what they are.
post #7 of 9
No, it would not result in a 100% performance increase due to factors like the FSB and NB channeling data along the processor to the memory and whatnot.

To get a 100% performance increase the memory also needs to be doubled in speed and the FSB would need a boost of some kind. 100% boost in speed therefore, is kind of impossible.

Going from say.. 2.5GHz to 5GHz could make a 75% performance increase if its done by just the cpu multiplier.

The FSB needs to be raised (none of this BE multiplier bs), and the memory would need to be overclocked pretty hard, to properly overclock and scale with the processor. Otherwise, things are being held back. If its done this way, it would probably be closer to a 95% increase which is great.

To get 200% performance though, I think it would need to get to 5.2GHz or... Scale the memory beyond 2666MHz, which will be crazy hard to do. 175% performance over stock should be acceptable. ^-^

Basically, you will have a FSB and Memory bottleneck that prevents you from getting 200% performance... You would need a FSB of 400MHz and memory of 2666MHz along with a processor at 6600MHz over say... 2800MHz stock. So basically, its impossible, and its why overclocking a SB chip from 3.3GHz to 5.2.GHz doesnt see a direct scale in performance increase, but more of a diminished return because of other factors.
Edited by Talon95 - 5/17/11 at 8:38pm
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post #8 of 9
Depends ENTIRELY on the application,
For Example If you are BIGADV Folding you can actually get greater that 100% boost,
a near linear increase + an increase in bonus
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post #9 of 9
Its sort of like putting double the horsepower in a car... just cuz you doubled the power doesn't mean you will double the speed... there are limiting factors that can actually increase as you push further and further...
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