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Bottleneck?

post #1 of 14
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Hey guys,

I've been playing Call of Duty Black Ops and Battlefield Bad Company 2 at 1680x1050 2-4 AAs, High/Very High Graphics quality.

The spec is as below, only that I'm currently on only one 4870X2.

I find that general game play is ok, but there are slight lags at times (I would say minimum fps would be around 20fps).

Note that my QX6850 is running at 3GHz, and my rams run at 400.

I wanna know where the bottleneck is !!

Please no silly answers, i'm not looking to upgrade anything soon. Just wanna know what the bottleneck in my system might be.


Thanksssss : D
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post #2 of 14
CPU would be my guess.
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post #3 of 14
Hate to say it but your whole system.
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post #4 of 14
Open up some monitoring software and watch your CPU and GPU usage. If one stays close to 100% more than the other it likely is the problem.

The only way to really tell what the exact bottleneck is to down clock things a little bit and see what has the largest effect.

Though I highly doubt memory will ever bottleneck anything as long as you have 4GB or more.
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post #5 of 14
Quote:
Originally Posted by Vagrant Storm View Post
Open up some monitoring software and watch your CPU and GPU usage. If one stays close to 100% more than the other it likely is the problem.

The only way to really tell what the exact bottleneck is to down clock things a little bit and see what has the largest effect.

Though I highly doubt memory will ever bottleneck anything as long as you have 4GB or more.
Just for the sake of clarity, allow me to point out: your overall CPU usage doesn't have to be anywhere near 100% for a CPU bottleneck to kick in, esp. not w/a quad. Many games cannot use all four cores with equal efficiency, and some can really only use one or two, period.

*IF* your CPU usage is pegged out, of course that is indicative of the probability of CPU BN. But they can totally happen at much lower % usages as well

Likewise, GPU usage that's below 99% is NOT necessarily indicative of CPU BN. Although it's a good place to *start* looking, it is entirely possible to get lower GPU usage for other reasons as well.

I'd also point out that unless you're talking about a *very* significant CPU bottleneck, OC'ing the GPU will always produce an overall higher FPS gain (calc'd on a % clock increase vs. % fps increase) than OC'ing the CPU, when you're talking about AVG fps over a long (as in minutes) section of a game.

However, the observation that OC'ing the GPU 'helps more' than OC'ing the CPU (on average) does not preclude the occasional FPS dip being caused by the CPU struggling at certain points/sections of the game

@OP ... one easy thing to try is to leave everything else as-is but lower the resolution down to the minimum, and turn off the AA. This of course lowers the GPU load dramatically, but the CPU load (per frame rendered) should stay roughly the same.

Now ... do you still get these same dips down to 20fps from time to time, or do they go away?

Whichever the answer is, you can probably put 2+2 together and deduce which of the two parts is causing these drops ... but let me know if you need me to explain further
Edited by brettjv - 6/8/11 at 10:07am
    
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by brettjv View Post
Just for the sake of clarity, allow me to point out: your overall CPU usage doesn't have to be anywhere near 100% for a CPU bottleneck to kick in, esp. not w/a quad. Many games cannot use all four cores with equal efficiency, and some can really only use one or two, period.

*IF* your CPU usage is pegged out, of course that is indicative of the probability of CPU BN. But they can totally happen at much lower % usages as well

Likewise, GPU usage that's below 99% is NOT necessarily indicative of CPU BN. Although it's a good place to *start* looking, it is entirely possible to get lower GPU usage for other reasons as well.

I'd also point out that unless you're talking about a *very* significant CPU bottleneck, OC'ing the GPU will always produce an overall higher FPS gain (calc'd on a % clock increase vs. % fps increase) than OC'ing the CPU, when you're talking about AVG fps over a long (as in minutes) section of a game.

However, the observation that OC'ing the GPU 'helps more' than OC'ing the CPU (on average) does not preclude the occasional FPS dip being caused by the CPU struggling at certain points/sections of the game

@OP ... one easy thing to try is to leave everything else as-is but lower the resolution down to the minimum, and turn off the AA. This of course lowers the GPU load dramatically, but the CPU load (per frame rendered) should stay roughly the same.

Now ... do you still get these same dips down to 20fps from time to time, or do they go away?

Whichever the answer is, you can probably put 2+2 together and deduce which of the two parts is causing these drops ... but let me know if you need me to explain further
Thanks for the detailed response
I tried overclocking my GPU quite a bit and it fps seems to increase slightly, then i reduce AA from 2 to 1 (in BF Bad Company2). It seems the bottleneck is at the GPU (although it is the highest end of the old days )

I'll also try putting in the second card to make tri-fire. Hopefully it will get even better.

Thanks very much (y)
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post #7 of 14
The 4870 supposedly has shoddy DX10 performance, if anything I'd point my finger at the GPUs.
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post #8 of 14
Quote:
Originally Posted by Hawk777th View Post
Hate to say it but your whole system.
I lol'd. OC Your CPU more if You can, it's not Your GPUs fault, it's CPU.

Edit: Also I don't think that somoe old CPU OCd to 3GHz will be enought for 4870X2. It's still a great card, and when it comes with additional 4870 it rocks even at highest details. So You shoud OC You CPU at least to 3.5GHz, I'm sure You'll see the difference
Edited by sp4wners - 6/9/11 at 5:34am
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post #9 of 14
Thread Starter 
Quote:
Originally Posted by sp4wners View Post
I lol'd. OC Your CPU more if You can, it's not Your GPUs fault, it's CPU.

Edit: Also I don't think that somoe old CPU OCd to 3GHz will be enought for 4870X2. It's still a great card, and when it comes with additional 4870 it rocks even at highest details. So You shoud OC You CPU at least to 3.5GHz, I'm sure You'll see the difference
hey man, i think you've got it wrong.
it's not "some old CPU OCd to 3GHZ", its Core 2 EXTREME stock at 3GHz!!!
EXTREME ain't stand for nothing, but sure i'm gonna OC up to 3.5-4 GHz and FSB to 1600+.
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post #10 of 14
Quote:
Originally Posted by top41 View Post
hey man, i think you've got it wrong.
it's not "some old CPU OCd to 3GHZ", its Core 2 EXTREME stock at 3GHz!!!
EXTREME ain't stand for nothing, but sure i'm gonna OC up to 3.5-4 GHz and FSB to 1600+.
Extreme stands for unlocked multiplier? OC it more I guess. Why are you running it at 3 ghz?
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