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CPU Bottlenecking question

rodrigox

rodrigox

rodrigox

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Joined
25 Sep 2009
Posts
114
Well as I heard a CPU is bottlenecking when your GPU Usage drops down and the CPU one goes 100%. But what happens when your GPU Usage drops a bit and your CPU usage dont even go higher than 60-70-80%? I noticed this on GTA IV but theres other games like this too, and I never see any game using 100% of the CPU, however sometimes GPU usage drops a bit.

And BTW, what about a gpu usage of 95-99%, is that a bottleneck?
 
The CPU doesn't have to go to 100% to be a bottleneck.
To explain it better, the game may only be able to make use of X amount of the CPU, and if it maxes out what it's able to use, that's a CPU bottleneck.

GPU usage at 95% would be a tiny bottleneck, not really worth mentioning, it's when it starts getting to 80% I'd be concerned.
 
Beat me to it ^^^^ :)

rodrigox said:
Well as I heard a CPU is bottlenecking when your GPU Usage drops down and the CPU one goes 100%. But what happens when your GPU Usage drops a bit and your CPU usage dont even go higher than 60-70-80%? I noticed this on GTA IV but theres other games like this too, and I never see any game using 100% of the CPU, however sometimes GPU usage drops a bit.

And BTW, what about a gpu usage of 95-99%, is that a bottleneck?
Click to expand...

Your CPU does not have to go to 100% to create a bottleneck, it just has to go high for it to start slowing the GPU. about 80% +
You should also look at individual cores, some games only load one or two cores, again if the load on them gets high it will start strangle the GPU even if other cores are sitting idle.

95% on the GPU is not necessarily a bottleneck, but anything more than that and i would say yes it is.

If you have one or more CPU cores running over 80% and the GPU running at less than 95% then you probably do have a bottleneck.

Read this illustration i made some time ago.

http://abundantcores.blogspot.co.uk/p/a-cpu-can-bottleneck-and-gpu-in-gaming.html
 
rodrigox said:
But for example GTA uses a max of like 75% and still, when there are a lot of peds and traffic the gpu usage goes down to like 90%.
Click to expand...

What CPU do you have and what cooling is on it? Is it overclocked?
And what GPU is it?
 
GTA IV is generally a poor port which runs poor on some decent computers. Not sure if they fixed it as I tried it a year or so ago but if you Google "GTA IV poor performance" you will get lots of results on forums with people complaining about how poorly it runs even though their computer should be able to handle it well.
 
Wait guys I uploaded the screenshots in bigger resolution so you can see the detail. Also imma post some Sleeping Dogs for a comparasion. I know that the i5 750 is still a great cpu, not much diference in clock per clock vs the new ones, I just wanna know more about the bottlenecking.
 
rodrigox said:
Ok so here it goes:

GTA IV Auto Config 1920x1080:
http://imageshack.us/g/1/10253542/
______________________________________________
Sleeping Dogs Max Settings (AA Normal) 1920x1080:
http://imageshack.us/g/1/10253597/

Sleepind Dogs Lowest Settings 1920x1080
http://imageshack.us/g/1/10253596/

As you can see in low settings theres parts where the CPU goes 80% and gpu usage still 98-99%.

Now my question, is the i5 750 bottlenecking IV or its just the bad optimization?
Click to expand...

Your 5850 is maxed out, you need to upgrade it for more performance in games.

The i5 750 with a more powerful gpu will do a great job especially when overclocked.
 
Martini1991 said:
It's more like maxing out your rig :p
Click to expand...

So yeah those gpu usage drops are due to the bad optimization of the game.

Cuz in all games I always have 98-99% of usage. And as you can see the cores usage are very scalated and not like core 1 is using 90% and core 2 80% and then core 3 and 4 using like 20 %. Thats also a good way to check if bottlenecks right?

Another question, would I have bottleneck with this CPU on a 7970ghz?

And to end my post I'll leave a link to a Multitask demonstration :p

 
A 7970 will be a big boost in games performance and the i5 750 should cope well enough at the 3.6Ghz you are running at.

You should also be able to get to 3.8Ghz - 4.0Ghz farily easily with a decent cooler.

I got a Noctua NH-C12P SE14 cooling my i5 760 and I run it at 4.0Ghz no problem.
 
the1gooner said:
A 7970 will be a big boost in games performance and the i5 750 should cope well enough at the 3.6Ghz you are running at.

You should also be able to get to 3.8Ghz - 4.0Ghz farily easily with a decent cooler.

I got a Noctua NH-C12P SE14 cooling my i5 760 and I run it at 4.0Ghz no problem.
Click to expand...


I have a Noctua NH-U12P SE2. I just dont know the correct settings for 4.0ghz.

Some screens of Max Payne 3 Multiplayer with gpu and cpu usage:
http://img59.imageshack.us/img59/4900/az4.png
http://img594.imageshack.us/img594/4448/pw4r.png
http://img163.imageshack.us/img163/8168/wif7.png
http://img32.imageshack.us/img32/668/bkz3.png
Just compare the optimization of Max Payne 3 with GTA IV.
 
Nuclear Fusion said:
Yeah, I often get 60% GPU usage in GTA IV, think it's just poor coding as I'm pretty sure I'm not CPU bottlenecked :)
Click to expand...

Correct, its a complete abortion of a game that rockstar couldn't be bothered to fix. One of the reasons why I'm not too fussed if we see GTAV on the PC.
 
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