Software Tuning, Performance Optimization & Platform Monitoring
Discussion regarding monitoring and software tuning methodologies, Performance Monitoring Unit (PMU) of Intel microprocessors, and platform updating.

All-core Turbo on Xeon E5-v2 Processors

John_S_2
Beginner
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I was looking for some quick statistics on turbo mode on the new E5-v2 processors.  The turbo frequency listed on the ARK site only applies when one core is being turbo'd, right?  I would like to know what frequency all cores can safely turbo to at all times for the E5-2667v2 and E5-2643v2.  Does anyone have these numbers?

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John_S_2
Beginner
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Did I post this in the wrong forum?  Where can I get the additional information on how turbo frequencies scale as more cores are used?
 

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Bernard
Valued Contributor I
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Try on ark.intel.com , go to "download links" and click on "download datasheet."

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John_S_2
Beginner
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I was unable to find anything in the datasheet.

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Bernard
Valued Contributor I
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Lets wait for the response from Intel engineers.

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TimP
Honored Contributor III
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You're probably correct that any turbo effect when multiple cores are in use is less than the quoted single core limit.  In my limited experience, I found nearly enough turbo boost on a 2.2Ghz CPU to match a 2.7Ghz CPU when all cores are in use. 

The "safety" aspect is handled by the combination of a hard limit which may depend on base clock speed and number of cores active, plus real-time thermal feedback.  Due to the thermal limiting, there will be sample to sample variations and possible dependence on the cooling system.  It's probably not surprising that you can't get quotations when some of the factors are external to the CPU.

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