CPU bottlenecks.. and its detection

blacksheep123 · Dec 17, 2014

as you see in my signature, i have a pretty normal generic everyday casual gamer system spec
my 6300 is overclocked at 4.1

i never thought abt checking for bottlenecks because i didnt notice any.. it performs decently in every game
today i thought id check .. i ran rivatuner stat server with hwinfo64 to check the stats ingame
i chose farcry 4 for this test since it gave me a decent 55-66fps ... i ran everything on ultra..

my gpu was running at 89-99% .. it was hard at work since its on ultra

my ram was abt 30% with no change... meh

most of my cpu cores were around 55-70% .. some were spiking to 100% for split seconds..

does this mean i have a slight bottleneck.. is my cpu grazing the bottleneck area
it doesnt bother me coz i get good playable framerates.. but an insight abt this observation will be very enlightening

Undying89 · Dec 17, 2014

How about the minimum framerate? Thats where you notice worst bottleneck. Those 55-66fps in FC4 are nice but how low it dips at some point? Intel tends to have alot higher minimum fps than AMD.

blacksheep123 · Dec 17, 2014

Undying89 :

it spike drops to the 40s but thats not constant..

OOHH.. now i see your point..

are you saying that the spikes to 100% makes my game spike down to the 40s?

Undying89 · Dec 17, 2014

Looks like it, yes. FC4 may not be best example but there is some CPU heavy games that you can test this.

blacksheep123 · Dec 17, 2014

Undying89 :

what do you think ? will a slight 100-200mhz overclock solve this "100%" spiking issue?

maddogfargo · Dec 17, 2014

blacksheep123 :

Not a CPU bottleneck.

Your GPU is peaking well before your CPU is peaking. If you have a 'bottleneck' anywhere, it's with the GPU. However, since you're saying you het pretty consistent 55-60FPS in Far Cry 4, I don't think you have a problem at all.

For comparison, I used to run a Phenom II 1090T @ 4.0GHz and it could drive a pair of HD 7950's in Crossfire on Crysis 3 maxed except for 2xSMAA (* Toms recommended best performance/appearance AA setting). The CPU would be at 90-95% on all 6 cores and both GPUs would be at 95-99%. FPS would average in the 50-60 range, and this was fairly well balanced, even on such an old CPU.

Spiking is likely just memory loading of assets.

blacksheep123 · Dec 17, 2014

maddogfargo :

blacksheep123 :

Not a CPU bottleneck.

Your GPU is peaking well before your CPU is peaking. If you have a 'bottleneck' anywhere, it's with the GPU. However, since you're saying you het pretty consistent 55-60FPS in Far Cry 4, I don't think you have a problem at all.

For comparison, I used to run a Phenom II 1090T @ 4.0GHz and it could drive a pair of HD 7950's in Crossfire on Crysis 3 maxed except for 2xSMAA (* Toms recommended best performance/appearance AA setting). The CPU would be at 90-95% on all 6 cores and both GPUs would be at 95-99%. FPS would average in the 50-60 range, and this was fairly well balanced, even on such an old CPU.

Spiking is likely just memory loading of assets.

so, you are saying spike downs are normal?
i dont have to worry abt it?

killer pc g15 · Dec 17, 2014

far cry 4 runs bad on amd because its not good multicore optised. the best way to detect cpu bottlenecks is by monitoring frametimes

blacksheep123 · Dec 17, 2014

killer pc g15 :

i dont know how to do it.. i will look into it

Wisecracker · Dec 17, 2014

"Some" CPU cores spiking at 100% is likely not an issue.

If you light them all up, across the screen, for an extended period ... that's a problem.

And like Mad Dog said, it looks as if your graphics use is higher (generally speaking) than your CPU utilization, and actually, looks quite well-balanced.

killer pc g15 · Dec 17, 2014

Msi afterburner can monitor frametimes a good value is around 20ms (50fps) and 34ms (30fps) is het maximum you would whont to see. everthing above 50ms could realy affect gameplay and shutter

http://www.vortez.net/articles_pages/frame_time_analysis,1.html

blacksheep123 · Dec 17, 2014

Wisecracker :

thanx for the input

blacksheep123 · Dec 17, 2014

killer pc g15 :

i tested the frame latency .. it was around 14ms with +/-1ms fluctuation .. i use a 50inch samsung TV

is it good?

Wisecracker · Dec 17, 2014

i tested the frame latency .. it was around 14ms with +/-1ms fluctuation .. i use a 50inch samsung TV

is it good?

Pffffff :lol:

That's great. I doubt 14ms will even register on a 60 Hz display.

blacksheep123 · Dec 17, 2014

Wisecracker :

so, its alright? i measured this with msi afterburner while playing farcry 4
i was doing a mission all guns blazing protecting a temple or a monastery of some sort

Wisecracker · Dec 17, 2014

Don't worry about it

Try to avoid obsessing over 'bottlenecks', imperceptible stutter, small spikes in frame times, etc., and enjoy your gaming.

blacksheep123 · Dec 17, 2014

Wisecracker :

thnx.. i posted this so i could learn something out of this situation

CPU bottlenecks.. and its detection

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