Intel procesor - TDP razlika

technolog je 6. jun 2015 ob 13:33 izjavil:

@Sentinel: Si prebral moj komentar na koncu posta? Če ima procesor TDP 47W, to lahko pomeni, da je njegov maksimalni konstantni (sustained) power consumption tu nekje. Lahko je 45, 43, itd, ni pa 35, ker to je že nižji rang.

It is reasonable end users would want to know the
power their servers are ex
pected to consume when
running “real world” workloads. Estimating server po
wer based on a worst case TDP specifications will
result in over estimating server power. Intel and AMD both agree on this point:
“It is of little value to
measure power consumption by only looking at t
he spec sheets for different components, adding the
totals together, because these generally
only report the maximum power consumption.
3
”
As such, an
ACP like value seems reasonable at first glance. However ACP only gives you the power of the
processors when running “real world” applications
. It doesn’t help estimating the power dissipated by
the other components in the server such as memo
ry, hard drives, I/O boards, disk controllers etc.

technolog je 6. jun 2015 ob 14:47 izjavil:

@Sentinel: Porabi do 15W pod konstantnim 100% loadom. Torej če teče na 3GHz. Če teče pod base freq, jasno manj.

Cinebench is a good long benchmark which shows us how the CPU will perform when maxed out for the duration of the benchmark. Here we can see where Core M starts to falter. On long sustained workloads, it has to cut the CPU frequency to keep within its thermal envelope, whereas the Broadwell-U and Haswell-U CPUs can keep the clocks a lot higher. While running the multithreaded R15, the Core M would hover around 1800-1900 MHz with all cores in use, and the Broadwell-U would lock in at 2400 MHz and stay there for the duration. x264 is similar, and is a very long benchmark. The higher power envelope of the U series processors allow for more work to be done. You can see the quad-core Dell XPS 15 really pulls ahead on these benchmarks, and the HP Stream continues to fall well behind.