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CPU Limited : how to really determine it ?

post #1 of 5
Thread Starter 
Hello,

While many devices can be measured in order to study/compare bandwidths (e.g. : "Your RAID car has x8 pci-e 2.0 connector but is plugged on a pci-e 1.0 slot : it will run constrained"), there is one statement that i don't know how to measure it : "CPU limited".

This formula can be heared so many times but remains unexplained when used...

Can someone, please, explain relation between CPU and GPU and specifies which relations are used to measure this "limitation" ?

Thank you very much
bubulle_b0x
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bubulle_b0x
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post #2 of 5
InB4 Balla...

wink.gif
Purpleannex
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post #3 of 5
Start task manager and see if a game pegs you cpu cores above xx%, usually it would be anywhere above 75%. I really just pulled that number out of my arse. But when your cpu is being worked that high on a game you will usually suspect that there is a bottleneck in the frequency clocks of your cpu. Thus a overclock may net your more FPS.

As far as i know there isnt a real formula, just need to test a cpu at stock and measure fps, Then overclock and measure fps.
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Casmatic
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post #4 of 5
Start task-manager and something like MSI Afterburner or GPU-Z.

Load up whatever game it is you want to play, and play it, or benchmark with it, or whatever it is you want to check against. Then simply look at the usage levels. Is your CPU @ 100% on all available cores while your GPU is using 10%? Is your CPU using 1 core at 15% and your GPU is smoking hot @ 100% usage? Are neither one utilizing 100% of their clock?

That's a pretty simple way to see where a game lies on the scale of limitations in comparison to your hardware.

Basically it is checking who is playing "catch up". Is your GPU waiting for your CPU to feed it data? Is your CPU waiting for your GPU to process the data it has fed it before sending more?
Edited by ocpokey - 4/20/11 at 3:17pm
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Bleeding Edge
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post #5 of 5
Thread Starter 
Thank you very much.

Nothing more purpleannex rolleyes.gif ?
bubulle_b0x
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bubulle_b0x
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