3 ms·
I wondered it this might be a reason for Intel disabling AVX-512 on it's most recent chips. >Electromigration is the movement of atoms based on the flow of cur
by GeekyBear 5y ago
I wondered it this might be a reason for Intel disabling AVX-512 on it's most recent chips.
>Electromigration is the movement of atoms based on the flow of current through a material. If the current density is high enough, the heat dissipated within the material will repeatedly break atoms from the structure and move them. This will create both ‘vacancies’ and ‘deposits’. The vacancies can grow and eventually break circuit connections resulting in open-circuits, while the deposits can grow and eventually close circuit connections resulting in short-circuit...
In Black’s equation, which is used to compute the mean time to failure of metal lines, the temperature of the conductor appears in the exponent, i.e. it strongly affects the MTTF of the interconnect
https://www.synopsys.com/glossary/what-is-electromigration.html https://www.synopsys.com/glossary/what-is-electromigration.h...
Intel's new chips already run hot and running AVX-512 instructions has required increasing the voltage.
>One of the big takeaways from our initial Core i7-11700K review was the power consumption under AVX-512 modes, as well as the high temperatures. Even with the latest microcode updates, both of our Core i9 parts draw lots of power. The Core i9-11900K in our test peaks up to 296 W, showing temperatures of 104ºC, before coming back down to ~230 W and dropping to 4.5 GHz.
There are a number of ways to report CPU temperature. We can either take the instantaneous value of a singular spot of the silicon while it’s currently going through a high-current density event, like compute, or we can consider the CPU as a whole with all of its thermal sensors. While the overall CPU might accept operating temperatures of 105ºC, individual elements of the core might actually reach 125ºC instantaneously. So what is the correct value, and what is safe?
https://www.anandtech.com/show/16495/intel-rocket-lake-14nm-review-11900k-11700k-11600k/5 https://www.anandtech.com/show/16495/intel-rocket-lake-14nm-...