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Concept of bottleneck

post #1 of 16
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Trying to understand how a graphics card get bottleneck when running on a lower end processor.

This weekend I am planning to run my graphics card on my friend's machine to see what difference I see. Planning on running couple game and Heaven 1.0 benchmark. My rig is in signature. His runs a E8400 with 4GB RAM and windows 7 32 bit edition. Wondering if I will see a significant difference. If not, I won't be happy coz I just upgraded my setup from a 775 socket.
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post #2 of 16
I would like to know this too, just thought about it earlier today. What is the relation between the components and bottlenecking, and how to spot which component is bottlenecking your system, is what I want to know. Maybe like a concept of bottlenecking or explanation would do well here, now for someone who knows to post
post #3 of 16
Would like to know also.
    
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post #4 of 16
really really basic hungover expl. lol
most all the components talk to eachother and need something listenting. well if the GPU wants to say a TON, but nothing else can hear it as fast as it wants to talk.....then u got yourself a bottleneck.
also, i would think your system is PLENTY fast and should most def. bench better then yoru buddies E8400

edit.....http://www.overclock.net/graphics-ca...eneck-gpu.html
Edited by qbical - 1/25/11 at 12:43pm
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post #5 of 16
A bottleneck is like trying to squeeze a watermelon through a keyhole. There is a lot of data coming in but it cant process it as fast so it becomes bottlenecked
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post #6 of 16
Quote:
Originally Posted by Awaz View Post
Trying to understand how a graphics card get bottleneck when running on a lower end processor.

This weekend I am planning to run my graphics card on my friend's machine to see what difference I see. Planning on running couple game and Heaven 1.0 benchmark. My rig is in signature. His runs a E8400 with 4GB RAM and windows 7 32 bit edition. Wondering if I will see a significant difference. If not, I won't be happy coz I just upgraded my setup from a 775 socket.
On most games, there won't be any noticeable improvement for native resolutions on 22" and 24"+ monitors. If you want to kid yourself, you can find some benchmarks that will score your quad much higher than his dual core or just run a gaming benchmark at a low resolution. In real world gaming, you won't notice anything on most games.
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post #7 of 16
The slower processor simply can't process enough information to keep up with the graphics card.

Bad Analogy that makes you understand it time

So let's say that the graphics card can input 100MB/s of data, and output 200MB/s of data.
This slower processor can only input let's say, 40MB/s of data, and output 60MB/s of data.
If the graphics card is dependent on the processor for it's next bit of data, say the next 100MB, it would only receive 60MB in the 1 second interval, so it'd have to wait for the processor to send the full 100MB.

Bad analogy, I know. But it works. lol.
post #8 of 16
if you want a rough answer...

Bottlenecks can occur with the following....

Pentium D and GTX 460 for example is a true bottleneck.

The Pentium D is old technology, The GTX 460 is practically brand new high end card, there is like a 4-5 year difference between the two. The Pentium D is what is bringing the performance down in this scenario. However something like a 4550 which is newer technology isn't bottlenecked by a Pentium D because its only a 64 bit card and barely uses any resources. A 460 is a 256 bit card that will rely on complex cpu calculations needed on the fly that only a Core 2 or newer can do without a performance hit.The GPU needs a CPU that can make the lines just as fast as the GPU can shade them.

Then there is bottlenecks like a Phenom II 940 and a 4870 where both are paired well together but can people get higher FPS's when they overclock. This isn't really a true bottleneck but people consider it one anyway.
Edited by dlee7283 - 1/25/11 at 12:51pm
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post #9 of 16
The relationship between components will vary with whatever you are trying to do.

Every component and every bus connecting them has a finite amount of performance or bandwidth. If one component cannot keep up with the task at hand, it's the bottleneck.

If you have a GPU setup capable of rendering 60 fps at the setting you chose, but your CPU can only do enough work (with AI, physics, or whatever) to send 40 frames to the card, you get 40 fps.

You can spot bottlenecks by altering the speed of the components in question. If you are getting 40 fps, and you change the speed of your CPU significantly in one direction or the other, but you don't gain/lose frame rate, obviously you do not have a CPU bottleneck in that task.
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post #10 of 16
Thread Starter 
Quote:
Originally Posted by sccr64472 View Post
On most games, there won't be any noticeable improvement for native resolutions on 22" and 24"+ monitors. If you want to kid yourself, you can find some benchmarks that will score your quad much higher than his dual core or just run a gaming benchmark at a low resolution. In real world gaming, you won't notice anything on most games.
If that is the case, wonder why I moved 'up' from my E7200....
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