Please help understand CPU speed

Forums › Laptops and mobile computers › Please help understand CPU speed > max?

Batman

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#153832 9-Oct-2014 11:02

Hi I was trying to see if my Handbrake re-encoding of home videos was efficient ...

I have a laptop i7 4702HQ and task manager say max speed 2.20 GHz ... but 8 "cores" are running at 100% and it says @ 2.86GHz ...

??

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#1150543 9-Oct-2014 11:03

(now if anyone can make Handbrake use my GT750M GPU that would be even faster!) thanks ...

sidefx

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#1150550 9-Oct-2014 11:10

That will probably be "Intel Turbo Boost"

intel: Intel® Turbo Boost Technology dynamically increases the processor's frequency as needed by taking advantage of thermal and power headroom to give you a burst of speed when you need it, and increased energy efficiency when you don’t.

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#1150552 9-Oct-2014 11:11

thanks ... still takes me an entire 24 hrs and a bit to finish

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#1150557 9-Oct-2014 11:15

Windows generally only recognizes/displays the default base speed (2.20Ghz in your case) and not the maximum achieved through using "Turbo Boost" (Intel SpeedStep) technology, which allows a boost to clock speed when running demanding applications and processes.

This spec sheet shows the default speed and the theoretical maximum boost of 3.2Ghz for your chip. This is in part affected by things like cooling and available power and the top end may be limited in some devices to reflect that.

Handbrake is recognizing the actually boosted speed when you are thrashing it with the encoding task!

Not sure how to force HB to use GPU encoding off the top of me head though - will have a look and see what I can find!

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#1150558 9-Oct-2014 11:16

Hah - took too long to type and sidefx beat me to it.

macuser

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#1150559 9-Oct-2014 11:17

Try the beta https://handbrake.fr/beta.php

Actually that looks as though it only hardware decodes, try it anyway as there is Intel Quicksync which may speed up things

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sidefx

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#1150560 9-Oct-2014 11:18

Yeap, sometimes it just seems easier to buy more spinning rust.

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#1150566 9-Oct-2014 11:23

In theory it is possible to force GPU usage in handbrake, through the process is a little obtuse.

Once you have selected your source, it should provide a check box for OpenCL and GPU encoding if the format/source/device support it in a way that it likes.

From the dev page:

"Front End Changes
We added two checkboxes on Handbrake’s main GUI to control the enabling/disabling of hardware support/OpenCL support. The process flow goes like this: launch the GUI and load the video file. Firstly, Handbrake will automatically check the platform for the DXVA decoding video formats supported and scan the video for its video format. With this information, it can determine if hardware decoding is supported. Secondly, Handbrake will check the platform for OpenCL support. The checkboxes for OpenCL and hardware decoding will be made visible on the GUI if they are supported, or made invisible otherwise. The user can use the checkboxes to choose to decode video using hardware (GPU) or software (CPU). In the case that OpenCL/hardware decoding are not enabled or chosen, CPU processing will be used instead."

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#1150685 9-Oct-2014 13:26

Ive found quicksync a bit fiddley to use with handbrake. Last time I tried it relied on the correct (beta) version, matched with the correct intel graphics driver etc...
But when it works it blows the other methods away (it went from ~50fps to >250fps) in speed and efficiency, but maybe not in maximum quality.
Quality was good, suitable for home use, but CPU quality can potentially be a wee bit better, with a huge speed penalty.

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#1150720 9-Oct-2014 13:53

If you are just converting video formats then you could also use Freemake.

It has a CUDA setting to use your Nvidia GPU.

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#1150725 9-Oct-2014 13:57

is this with the windows 8 task manager by chance?

i have noticed it reads wrong quite often - as confirmed by the many respected tools out there..

its something that frustrated me a bit.

Quicksync is one encoding method i have never really looked at doing - have my on-board gpu disabled as there is no point in it being enabled in the first place..

nvidias NVENC is an interesting one too, in my testing it was noticeably faster than but also was noticeably more crashy. - as tested with Vegas pro 12.
To take this a step further, Although not Quite relevant for your case.. Shadowplay isnt mature enough for any serious recording, Options are not quite there to split audio channels right out, if you alttab alot your going to have a hard time. - Especially with a Source based engine.

Handbrake i just let it go hard on my cpu, overclocked 3770K doesnt take very long to reencode my raw footage if i dont wish to use it straight away (180GB clips for compet dont take long to fill things up afterall.)

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#1150734 9-Oct-2014 14:07

No to make my dslr files smaller while preserving picture quality. Handbrake I trust as I found a setting that reduces file size and preserve quality at pixel level.

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#1150735 9-Oct-2014 14:08

Yes win 8.1.
Confirmed by cpu z