How can i tell if my CPU is bottlenecking my GPU?

pedromendez · Dec 18, 2013

Hello,

I recently bought a GTX 770 which was an upgrade from my 6970 amd. I reinstalled windows to make sure no drivers were interfering and upgraded from windows 7 to 8.1.

My question is i will get fairly decent FPS (Constant 53) on FFXIV for a good few minutes on maximum and then it starts jumping from 53 down to 20 and back to 53. (This causes audio stutter as well as graphical)

Same goes for DAYZ which is less of a stutter but just lower fps if i move the camera rapidly.

Specs:

1090T OCed at 3.6GHZ
2x2gb ram
MSI GTX 770
650 xfx psu

http://s981.photobucket.com/user/petemorley/media/gpu_zpsd432dcea.png.html

Is a picture of my GPU usage after a few minutes on Dayz.

Any help will be greatly appreciated!!!!

Supahos · Dec 18, 2013

I think you're looking in the wrong place looks more like thermal throttling with the CPU since the audio goes choppy as well it's likely not the video card.

13thmonkey · Dec 18, 2013

+1 thermal is quite likely

JOOK-D · Dec 18, 2013

Pay attention to your FPS, CPU, and GPU usage. Try running a game at max settings and slowly turn them down, checking FPS and the usage of both CPU and GPU as you do so. If you don't seen an increase in FPS as your graphics details are lower, then you are most likely CPU bottlenecked. However, it is very dependent - no-one is seeing great frames in DayZ at the moment.

pedromendez · Dec 18, 2013

On FFXIV if i change my graphics from maximum to standard desktop there is no change in max FPS what so ever. (53)

13thmonkey · Dec 18, 2013

ignore dayz as an indicator, i'm seeing 50% cpu and 50% gpu utilisation and poor framerates with no thermal issues, I think that the network ends up being the bottleneck, very very odd game.

Supahos · Dec 18, 2013

Your cpu never worked as hard with your old GPU, now it is having to work much harder to feed that 770, it went from waiting on the GPU, to being the bottleneck itself this could cause heating issues to arise where there weren't issues before.

pedromendez · Dec 18, 2013

Okay this is interesting.

http://s981.photobucket.com/user/petemorley/media/gpu1_zpsa33e8e05.png.html

So i windowed it while playing and i was still getting major stutters but look at the gpu usage and CPU usage.

Might i have an issue with my GPU?

Supahos · Dec 18, 2013

Well It could be but you're still not showing enough to know what the temp of your processor is... additionally you could be running out of ram, looks like you're showing over 70% usage when that screenie was taken.

Weedster · Dec 18, 2013

Yea monitor you CPU and GPU usage can also do it on a benchmark like Furmark, and for CPU well you know the good old CTRL-ALT-DEL tells you all about your CPU/RAM usage, if it's constantly on 100% like me when I play bf4 with my dual core, then it's bottlenecking.

Could be heat issue also.. I know one of my core is heating much more than the other (thanks to AIDA64) and 1 core goes up to 75-80 even I think.. I though that could cause lag spikes but I've been too lazy to remove my cooler and re apply thermal paste.. lol. well the most boring part is unscrewing the mobo and messing arround with the cables..

pedromendez · Dec 18, 2013

Okay as you can see here

http://s981.photobucket.com/user/petemorley/media/gpu3_zps07f3bd65.png.html

At first i am getting 100% GPU usage and the fps is silky smooth then it goes bonkers and starts shooting up and down

Supahos · Dec 18, 2013

Maybe I'm crazy but it still looks like the GPU usage is staying pretty consistent, fan speed changes but that doesn't much matter, seems to me still its your processor getting too hot, but maybe I'm wrong.

pedromendez · Dec 18, 2013

GPU usage is bouncing between 20% and 60%

13thmonkey · Dec 18, 2013

what is the gpu clock speed, my thought is that it is throttling,

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How can i tell if my CPU is bottlenecking my GPU?

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