I can not seem to find any information on this anywhere. How can the i5-4690S run at 65W and be able to perform at 3.90GHz w

[Ivannovish]

I cannot seem to find any information on this anywhere. How can the i5-4690S run at 65W and be able to perform at 3.90GHz while the i5-4690, which seems to have the exact same specifications, (3.90) runs at 84W?

 

[LucoTF]

I cannot seem to find any information on this anywhere. How can the i5-4690S run at 65W and be able to perform at 3.90GHz while the i5-4690, which seems to have the exact same specifications, (3.90) runs at 84W?

Lower base clock, same turbo speed.

 

[Jason Light]

The S will be more likely to throttle down, and will employ more energy saving tactics which may compromise performance, such as differing instruction sets. Also the 4960S has a lower base clock which means on average it will be running slower and will have a lower average power consumption.

The CPU governor on the S is probably a lot more conservative which will result in this behaviour. Basically despite the same turbo clock the S will typically be slower, use less power and produce less heat.

 

[Y0GI]

Here is a specs comparo: http://ark.intel.com/compare/80810,80812

The S chip has a different heatsink/fan and a slightly lower max temp.

Yogi

 

[Ivannovish]

Let’s just agree that the TDP rating is lower because the "S" version has a lower base clock. My concerns are about the Turbo Boost speeds and Turbo Boost Wattage.

"If the power, current, or thermal limit is reached, the processor will automatically reduce the frequency to stay within its TDP limit."

Now this was my question from the beginning really:
it is my understanding that since the 4690S version on paper has a lower TDP limit than the 4690, The 4690S should revert back to base clock speed faster from a Turbo Boost than the 4690 because of its lower thermal limit. (Assuming they both went beyond their thermal limits of course)
I ask this because as you know, they both run at the same Turbo Boost speed (3.90GHz) and I would obviously want the processor that can maintain 3.90GHz for a longer duration of time.

 

[Ivannovish]

Let’s just agree that the TDP rating is lower because the "S" version has a lower base clock. My concerns are about the Turbo Boost speeds and Turbo Boost Wattage.

"If the power, current, or thermal limit is reached, the processor will automatically reduce the frequency to stay within its TDP limit."

Now this was my question from the beginning really:
it is my understanding that since the 4690S version on paper has a lower TDP limit than the 4690, The 4690S should revert back to base clock speed faster from a Turbo Boost than the 4690 because of its lower thermal limit. (Assuming they both went beyond their thermal limits of course)
I ask this because as you know, they both run at the same Turbo Boost speed (3.90GHz) and I would obviously want the processor that can maintain 3.90GHz for a longer duration of time.