Intel's Fastest Processor Ever.....and the Burst Mode Trick.
The tiny "4.5W" Core M seemingly humiliates the previous record holders,
including the Core i7 4790 Devil's Canyon running at a burst speed of 4.4GHz.
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I guess we will see many claim that Intel's new 14nm process is now 20
times more power efficient as Intel's 22nm process or similar wild claims.
(Even though Intel itself never made such outrageous claims of course)
Those who know how Intel's Burst Mode work will understand how you
can produce these kind of miraculous benchmark result. They will wonder
instead if the new F-stepping can now officially be boosted to 4+GHz
for very short periods of time.
Here's explained how it works:
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The figure at the bottom right with the three blue spikes explains it all.
The blue spikes mean that the processor is running at maximum frequency
while during the intervals the processor is basically halted.
Say with a single active core Broadwell at 14nm, running a 4+GHz requires
~18 Watt (would be very good!).
A power dissipation of 4.5 Watt would mean that the processor is bursting
at maximum frequency during 25% of the time and idle during 75% of the
time to cool down.
You can't measure this at the outside of the package because the on-
package voltage regulators and capacitors take care of the large power
and current spikes. From the outside you only see a processor using
4.5 Watt.
The benchmark can't see this either. It measures the "process-time"
when the processor is active and running at maximum frequency.
The benchmark doesn't measure the time when the processor is idle
and cooling down. Therefor you get a benchmark result as if the
processor is running always at maximum burst frequency.
Hans.