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I see in specifications for new platinum Xeon that they have 3 speeds: slow for AVX512, medium for AVX256 and full speed for plain vanilla code.
Also the Knights Landing slows down 200 MHz for AVX and the Xeon V3 slow down 400 or 500 MHz on AVX256.
I cannot find anything about desktop i7 frequency when crunching AVX. A few people have asked this question in the past but didn't get a straight answer.
Now I see a recent post about overheating during AVX, so I presume there is no pre-emptive slowdown for AVX in i7.
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Hello RobinK,
Thank you for contacting Intel Communities.
Let me do further research on this and I will get back to you once I have more information.
Best Regards,
Juan V.
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Hi RobinK,
Sorry for the delay.
You can refer to our processor datasheet per generation under "Technologies"
Intel® Core™ Processors Technical Resources
https://www.intel.com/content/www/us/en/processors/core/core-technical-resources.html https://www.intel.com/content/www/us/en/processors/core/core-technical-resources.html
You can also refer to these link that contains more information about AVX:
Intel® Advanced Vector Extensions (Intel® AVX)
https://software.intel.com/en-us/isa-extensions/intel-avx https://software.intel.com/en-us/isa-extensions/intel-avx
Intel® AVX-512 Instructions
https://software.intel.com/en-us/blogs/2013/avx-512-instructions https://software.intel.com/en-us/blogs/2013/avx-512-instructions
About the question: "Now I see a recent post about overheating during AVX, so I presume there is no pre-emptive slow down for AVX in i7"
Can you please specify the processor you are referring to for this issue?
Bear in mind that there is another community that you can reach in case you have further inquiries regarding this:
https://software.intel.com/en-us/forum Intel® Developer Zone Forums
Best Regards,
Juan V.
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Hi RobinK,
After reviewing this case, I have noticed I am missing the processor model number. Do you happen to have the processor information?
Thank you for your time.
Allan J.
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