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Another 8800GT Question... [Bottlenecking]

post #1 of 6
Thread Starter 
Yo guys, tis' me again

[For people that were in the other thread - Gettin an EVGA 8800GT Over the weekend Winn.]

Anywho...

I like to leave me X2 4400+ Running @2.8GHz

@8800GT Stock speed, am i right in saying that WONT be bottlenecked by the CPU

@What 8800GT Overclocked speed am i likely to see CPU bottleneck @2.8GHz

And can someone explain CPU Bottleneck? I dont really understand it much, and im unsure if theres any solid evidence behind it

Thanks

Haunt
    
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post #2 of 6
The stock 8800GT will be bottlenecked at that speed. My 8800GT is bottlenecked by my processor at 3.2Ghz. I am not exactly sure how to explain bottlenecking, but I know someone else on OCN could definitely explain it .
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post #3 of 6
Depends on what you are running.

There are certain programs/games where I am bottlenecked quite baddly by my E2140 @ 3.2GHz.

On the otherhand there are other situations where my overclocked 8800GTS 512 is the limiting factor, and would be even if my CPU was all the way back at stock.

As for the definition of bottlenecking, well it's simply what happens when performance of one component is limited by another. If your CPU can feed 60 frames per second to your video card, but the card is only able to process and put out 30 fps at the settings you have chosen, a new CPU would not help much, where as a faster video card could give a massive boost.
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post #4 of 6
In the simple term, CPU and GPU should be about matched/equal so that they don’t need to wait for each other. In your case, it refers to cpu bottlenecked. For instance, if CPU is about equal to or great than GPU then, data will be processed as soon as GPU sends data. Otherwise, even GPU sends out same amount of data, your CPU needs more than one batches to process those data. There is an article in tom hardware to explain this. With latest GPU, the CPU needs to operate at 3.2G at least.


Also, here is another link.
http://www.overclock.net/hardware-ne...ng-gaming.html


post #5 of 6
From my understanding, lets say you're getting 7k in 3DMark06 with a stock E2140 cpu and a stock 8800 GT. Now that is a little low for a score. So you overclock that E2140 to 2.2 ghz and you see your score jump to 8k. That would show that your E2140 is your limiting factor (bottleneck). Then you overclock your cpu to 3.2 ghz and your score breaks 10k. So what I guess is, if your cpu is bottlenecking you, it will hold back your gpu performance and with just a little overclock on the cpu, you'll see a bigger gpu performance increase.

I don't know if I'm right with this. I'm kinda just going off of my past experiences.
post #6 of 6
I think if you want to get a good idea on when your cpu is no longer the bottleneck try this.

Look at the Detailed results on 3DMark06 with your cpu & gxf card stock, say you get 30fps average on the first test. Then OC your cpu until the average fps in that one test stops increasing. That is were your cpu is no longer the limiting factor.

You cant really look at the whole 3DMark score, because some of the tests are purely cpu, and they will keep going up as you OC your CPU more and more.
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