CPU Bottlenecking GPU's

Quantum- · Aug 15, 2013

I have 2 Sapphire Vapor X - 7770's Ghz Edition in Crossfire.

I have been doing test lately, trying to determine why I am getting terrible performance, and low gpu usage. My CPU ( FX - 4100 ) is at 100% usage during gaming, and I get low fps/low gpu usage due to this bottlenecking. I just want to confirm that this is my problem for having Crossfire Issues. What CPU will not bottleneck these cards? I was thinking of getting a FX - 6350.

fkr · Aug 15, 2013

http://www.hwinfo.com/download.php

use the sensor only option and double click on cpu usage so you can see if it is maxed out all the time.
http://prntscr.com/1lc7zm

this is an example of what you will see, best of luck I have to run,bbl

Seladon-1370374 · Aug 15, 2013

Yes your CPU is the bottleneck, and the FX-6350 would fix that problem.

Quantum- · Aug 15, 2013

I monitored my CPU usage in task manager during gaming and it was at 100%, so I guess that is a bottleneck

fkr · Aug 15, 2013

good old hwinfo64 never lets me down.. out of curiosity how close are you to 100% gpu utilization.

Quantum- · Aug 15, 2013

fkr :

Not close at all. low gpu usage for both cards.

Quantum- · Aug 15, 2013

So I overclocked my CPU about 10%, and in MW3 the cpu usage is about 50%, and not 100%. The odd thing is that my GPU2 Usage is at 99% load during games, and my GPU1 is about 30% usage, and I get worse performance than one card still. Any ideas as what is causing this?

fkr · Aug 15, 2013

are you using the new beta drivers

Quantum- · Aug 15, 2013

fkr :

Yes. I am using the new beta drivers.

fkr · Aug 15, 2013

do you have riva tuner statistics server and msi afterburner on your computer. so you can see fps and as well as cpu usage and gpu usage in realtime.

the severe lowering of CPU usage is weird.

what speed RAM are you using

also have you tried another game, in particularly a gpu intensive one

Quantum- · Aug 15, 2013

I have msi afterburner, and can see my gpu usage/cpu usage on my second monitor. 1600mhz Ram 8gb. I have tried other games, and same thing.

fkr · Aug 15, 2013

can you run heaven benchmark and replicate the problem

http://unigine.com/products/heaven/download/

your cpu should not bottleneck with that and it should max out your setup

also when you were overclocking did you by chance have to reset your bios and now neeed to change your pcie lanes to be shared as 8x 8x

Quantum- · Aug 15, 2013

fkr :

Will run it now. What settings should I run it in?

fkr · Aug 15, 2013

is modern warfare a dx9 game. if so the new drivers are not working well with dx9 and you would need to turn of the framepacing feature in CCC. that may help

fkr · Aug 15, 2013

i would max it out in windowed mode and see what happens. you can play with settings in real time that way

Quantum- · Aug 15, 2013

fkr :

I tried turning of framepacing and that did not help. And CrossFire does not work in Windowed mode, so can't run the benchmark in windowed.

Quantum- · Aug 15, 2013

Results : http://gyazo.com/4fbb4dd482022c4e6171718da99681ba

Fairly high settings, and I was looking at the gpu usage's and they seemed to be flush, and on the same level with each other.

Quantum- · Aug 15, 2013

fkr :

These are the results ^^^

fkr · Aug 15, 2013

are you running max settings in mw3.

also do you have the new metro game. try running there benchmark if you do.

need to see if it is just that game or not

Quantum- · Aug 15, 2013

Update : Tryed to play CS:GO and got 20 fps ! I usually get about 150fps without crossfire. One card is at 99% usage while the other is at about 30.

Quantum- · Aug 15, 2013

fkr :

I had max settings, and played with them, and it was still bad.

Don't have metro : last light, and just posted that CS:GO is doing the same thing. Not the games that are causing it.

fkr · Aug 15, 2013

this is weird, I feel like i am missing something. everything was working before the overclock right. you may want to go back into your bios settings and go back to default settings and alkso look for something else that may have changed.

Quantum- · Aug 15, 2013

No. Everything was not working before the overclock. All BIOS settings are fine.

Quantum- · Aug 15, 2013

I just did a GPU-Z Render test, and it said my second GPU was PCI e x16 @ x1 2.0, while the other is PCI e x16 @ x8 2.0 Why is my second one read as x1, they should both be x8/x8.

fkr · Aug 15, 2013

the only way I know how to change that is in a settings in the bios. that is how it works on my rig. what is your motherboard. I will try and find your manual and find that setting if it is there.

CPU Bottlenecking GPU's

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