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Cpu usage during 1080p video

Last response: in Graphics & Displays
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May 31, 2010 7:05:07 AM

hi, i watched a 1080p movie today, and found out that cpu usage is 80% all the time . and gpu temp increases only 3C during movie.
my spec is
e6300 wolfdale (2.8 Ghz, not the old one)
3 GB ddr2 800
evga GTS 250 512MB
p35 ds3l mobo
450w corsair...
i couldnt use riva tuner for this card, it doesnt show gpu load percentage, so i set the fan at 35% and watched the temperature to approximate the load during the movie. i also locked the clocks at normal 756mhz, 1836mhz, 1100mhz. core, shader, and memory respectavly by evga precision. at idle with 35%, temp is 63C. and during movie, it is 66C. again, with same fan speed 35%. i know this is weird way to look at gpu load. but i think i can make a guess by these values.
when this gpu is fully loaded with games, like crysis, temp will go up to 74C with 60% locked fan, or to compare with low fan speed ( i risked it just to see the temp..) 98C with 40% fan rotation. i turned off the game right when i saw 98C because it was increasing about 1C in 2 secs
i heard from different places on internet, that a decent gpu will take work from cpu when watching hd movies. is this normal cpu usage during 1080p movie?

More about : cpu usage 1080p video

a b Î Nvidia
a b à CPUs
May 31, 2010 10:16:42 AM

Watching movies, especially 1080p movies are CPU job not GPU, so i think your CPU usage at 80% is okay...

Just to make sure, what do you get it when idle? I mean CPU usage, what % ?
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a c 172 Î Nvidia
a b à CPUs
May 31, 2010 10:38:43 AM

What you need is a player that can do DXVA, then the GPU will do the work not the CPU. MPC Home Cinema v1.3.1899.0 for example.
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a b à CPUs
May 31, 2010 10:49:19 AM

With your hardware, 80% cpu usage is pretty high. What video player are you using?
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a b Î Nvidia
a b à CPUs
May 31, 2010 10:56:56 AM

Mousemonkey said:
What you need is a player that can do DXVA, then the GPU will do the work not the CPU. MPC Home Cinema v1.3.1899.0 for example.


^
So, when watching 1080p video, the GPU will do the job and not CPU, is it right Mod?
I'm sorry that i'm wrong when i giving info to the OP...
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a b à CPUs
May 31, 2010 11:01:37 AM

wa1 said:
^
So, when watching 1080p video, the GPU will do the job and not CPU, is it right Mod?
I'm sorry that i'm wrong when i giving info to the OP...


If your video player doesn't know how to access, or it simply doesn't access the gpu, all the work gets passed onto the cpu. In your case though, it seems that a lot of work is still passed onto the cpu.
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a c 172 Î Nvidia
a b à CPUs
May 31, 2010 11:15:10 AM

wa1 said:
^
So, when watching 1080p video, the GPU will do the job and not CPU, is it right Mod?
I'm sorry that i'm wrong when i giving info to the OP...

No worries, you are right in that with older software the CPU will be doing all the work but wrong in that with newer software the workload will be offloaded to the GPU. Check this bit out, it's from a fairly recent review :- http://www.guru3d.com/article/geforce-gtx-465-sli-review/9
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a b Î Nvidia
a b à CPUs
May 31, 2010 11:18:50 AM

wow, i learned something new again...
thanks a lot, Mod also amnotanoobie... :D 
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a c 172 Î Nvidia
a b à CPUs
May 31, 2010 11:34:20 AM

I've been using the aforementioned version of MPC with the 257.15 beta drivers and it does seem to do the offloading bit quite well considering that I'm using a lowly 9500GT, the CPU fan does a lot less work now. ;) 
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a b Î Nvidia
a c 480 à CPUs
May 31, 2010 1:15:37 PM

MPC is a nice little program.
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June 1, 2010 5:17:14 AM

wa1 said:
Watching movies, especially 1080p movies are CPU job not GPU, so i think your CPU usage at 80% is okay...

Just to make sure, what do you get it when idle? I mean CPU usage, what % ?



its 0 - 3 %
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June 1, 2010 5:22:36 AM

i didnt know the player matters. with MPC, cpu is at only 15%

thanks alot for this info!
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a b à CPUs
June 1, 2010 5:25:49 AM

jhyukkang said:
i didnt know the player matters. with MPC, cpu is at only 20%

thanks alot for this info!


20% sounds just about right for 1080p.
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June 1, 2010 5:38:12 AM

is it harder for cpu to calculate hd movies than gpus?
it seems like my gpu does this work like nothing when cpu gets rapes when cpu does it by itself
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a b à CPUs
June 1, 2010 7:49:12 AM

jhyukkang said:
is it harder for cpu to calculate hd movies than gpus?
it seems like my gpu does this work like nothing when cpu gets rapes when cpu does it by itself


The GPU does this better because it is what the gpu was designed to do, process and load pixels onto your screen.

The cpu is designed to do a little bit of everything, so it excels in nothing. The gpu was made to push pixels, which incidentally is also about number crunching. That's why gpu's are good for parallel compute applications.
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