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Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-12, 21:01 PM

I bought a ThinkPad X240 recently.  On Lenovo's website, it says the max speed is 3.30 GHz.  However, in the Windows 8.1 Task Manager, it says the maximum speed is 2.69 GHz.  See https://dl.dropboxusercontent.com/u/6625784/task_manager.jpg

 

Any idea why there is a discrepancy?  I also tried running Prime 95 for a little while and noticed that the "Speed" in Task Manager never went above 2.70 GHz.  Did I somehow get a weird i7-4600U processor that has a max speed of only 2.7 GHz?

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24 Posts

11-27-2007

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Re: Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-17, 20:15 PM

The 3.3Ghz boost is a single core bost. The max boost with dual cores is 2.7Ghz. If temps allow it will boost up to 3.3Ghz with a single core.

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7 Posts

08-12-2014

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Re: Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-12, 21:06 PM

No answer for you, sorry. But mine also says 2.69Ghz

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Re: Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-13, 12:10 PM

Thanks for the reply.  Good to know I'm not alone.

 

Anybody else?

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Re: Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-14, 14:36 PM

That's Intel's Turbo Boost causing confusion. The CPU has a normal rated frequency, and a Turbo Boost maximum frequency. The Turbo Boost frequency at any particular time depends on the operating conditions of the CPU (power, current, and temperature).

 

For the Core i7-4600U the normal rated frequency is 2.1GHz, and Turbo Boost maximum frequency is 3.3GHz:

http://ark.intel.com/products/76616/.

 

Hope this helps!

 

 

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Re: Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-14, 20:09 PM

I appreciate the response, but I still don't understand why the Windows 8.1 Task Manager would report a "maximum speed" of 2.69 GHz while Intel reports the maximum speed to be 3.3 GHz.

 

2.69 is also not the nominal clockspeed of the i7-4600U... It is supposedly clock speed of 2.1 GHz with Turbo Boost to 3.3 GHz.  So I have no idea why Win 8.1 Task Manager reports 2.69 GHz as the "maximum speed."  Is Windows just flat out wrong?  Does Lenovo do something to prevent it from getting to 3.3 GHz?

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Re: Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-16, 0:09 AM

Hi phositadc,

 

Yes, Windows Task Manager, and 3rd-party tools, doen't always get it right. Try the Intel Processor Identification Utility.

USB-C: Just cos it fits don't mean it works.
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Re: Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-17, 20:15 PM

The 3.3Ghz boost is a single core bost. The max boost with dual cores is 2.7Ghz. If temps allow it will boost up to 3.3Ghz with a single core.

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Lenovo Thinkpad T410s (retired)

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0 person found this solution to be helpful.

This helped me too

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28 Posts

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Re: Maximum speed of X240 Core i7-4600U processor only 2.69 GHz?

2014-08-17, 20:41 PM

Thanks for the info.

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