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how can someone know if a CPU is bottle necking a GPU?

post #1 of 30
Thread Starter 
how can someone know in general if a CPU is bottle necking a GPU?

any apps available ? methods?


and please i had some thread locked because of (trollin and flametail things) so please take it easy i`m noob in GPUs


+rep to all help
    
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post #2 of 30
Run a few games and look up the average GPU usage while playing.

If it's not 95%-99% under heavy load, you're bottlenecked.
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post #3 of 30
Quote:
Originally Posted by Devilmaypoop View Post
Run a few games and look up the average GPU usage while playing.

If it's not 95%-99% under heavy load, you're bottlenecked.
with vsync OFF
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post #4 of 30
run furmark and see if you got >95% gpu usage?
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post #5 of 30
You just feel it, just download MSI Afterburner, open up a game without vscync and check if your gpu is performing at 95%+.
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post #6 of 30
Thread Starter 
Quote:
Originally Posted by MrKrrrinkle View Post
with vsync OFF
why v sync ?
    
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post #7 of 30
OP, 1) what games do you play? what is your res? 3) do you normally use v-sync?

There are situations where a PH II is bottleneck and many where it is not. In general, if you use in-game monitoring software, like MSI Afterbuner's OSD function, you can determine if there is bottleneck if the usage is not >95% (v-sync off).
post #8 of 30
Quote:
Originally Posted by Crag View Post
why v sync ?
Vsync limits your framerate, thus limiting your GPU usage.
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post #9 of 30
One basic method is to run the application /game with different CPU speeds and observe the performance(eg framerate). If the performance increases linearly, then there is most likely a CPU bottleneck. The steeper the slope , the larger the bottleneck at that specific speed .
post #10 of 30
Vsync matches your monitors refresh rate/frequency, with a 3D applications frame rate.
So if you got 60Hz screen you will have 60FPS max.
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