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why doesn't a game use 100% of the CPU power?

post #1 of 9
Thread Starter 
Im playining far cry 3 with 3570k the HD 4000 which is a very good IGP IMHO the trick is to set the processor affinity for the game to core #1 #2 and #3 and set all other system processes to core #0 so 3 cores can concentrate solely on crunching graphics instead of having to wait state the game for a micro-second or two and cause micro-stutter, if you ask me Intel should have had a built in option for such a setup when gaming with the IGP.. but enough about that..

the CPU seems like it should be at 100% usage since it is running far cry 3 but it stays around 16% usage (even though the game runs smooth, so its not so much a problem question but more of a curious question).. also i have the system set on "High Performance" but he CPU is showing a dip from 4.4Ghz to 2.1Ghz every 3 seconds, should it stay at 4.4?
post #2 of 9
The IGP is a completely separate chip, attached to the CPU chip. The CPU itself does not render any graphics. Your core assign method will still help if for some reason a background program was trying to run on the same core, but modern versions of windows are pretty good at managing that properly themselves.

In the end, the IGP is not a very good graphics card compared to a dedicated one, so you have a bottleneck there. The CPU isn't being used much because there isn't any point, your frames are limited by the graphics chip.
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post #3 of 9
If the CPU isn't being fully utilised and sometimes enters an idle state yet the game runs fine, I'd say that means the game isn't particularly taxing on the CPU, most likely because the IGP can't handle much more. smile.gif If you meant the IGP, that's separate from the CPU cores so even if it's taxed 100% you won't be able to tell by looking at CPU utilisation.
That said, if you want the CPU to keep running at 4.4GHz all the time go to advanced power management, scroll down to the CPU part, and make sure "minimal CPU status" (or something, my OS isn't in english) is set to 100%.
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post #4 of 9
a 3570k with no dedicated gpu and then playing games rolleyes.gif
the IGP is holding you down bigtime
post #5 of 9
Thread Starter 
i see, so the IGP is totally separate from CPU operation, makes sense thumb.gif i thought the whole of the CPU was utilized as part of the IGP, thanks all!
post #6 of 9
Quote:
Originally Posted by Vonnis View Post

If the CPU isn't being fully utilised and
That said, if you want the CPU to keep running at 4.4GHz all the time go to advanced power management, scroll down to the CPU part, and make sure "minimal CPU status" (or something, my OS isn't in english) is set to 100%.
It is "Minimal processor state"
Normally I wouldn't have known how they exactly put it in the OS in English but I'm currently running the 8.1 preview so I could just peak at it.
You know even for the Metro apps that are available I rather use the desktop version it really doesn't work for me might be due to the screen being 39 inch though and being a poweruser wink.gif
post #7 of 9
Your cpu would need 3000+ cores to match current graphic cards performance.
But your cpu can run an OS with less than a percent of utilization.

It was easier to simply dedicate a processing unit for graphic (GPU) and another for general processing task but more complex (CPU). Now mobility requires to merge both into a single one and technology allows it.
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post #8 of 9
Quote:
Originally Posted by Just a nickname View Post


It was easier to simply dedicate a processing unit for graphic (GPU) and another for general processing task but more complex (CPU). Now mobility requires to merge both into a single one and technology allows it.

That makes is sound like they are the same chip, when they aren't tongue.gif. They aren't really merged into a single one, they are still separate chips, just cuddling really close.

The best analogy I've heard is that a CPU is like a math professor, and the GPU is like a class of beginner students. If you need a complex math problem done, the professor would do it much faster then a class of students. If you need a ton of easy math done, the class will be much faster then the professor. That is why the CPU doesn't run graphics itself.
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by Crazy9000 View Post

That makes is sound like they are the same chip, when they aren't tongue.gif. They aren't really merged into a single one, they are still separate chips, just cuddling really close.

The best analogy I've heard is that a CPU is like a math professor, and the GPU is like a class of beginner students. If you need a complex math problem done, the professor would do it much faster then a class of students. If you need a ton of easy math done, the class will be much faster then the professor. That is why the CPU doesn't run graphics itself.

I like that analogy thumb.gif
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