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I need fanboy help asap! Zug Zug!

post #1 of 14
Thread Starter 
Driver issue, or cpu bottleneck?

4,844~MHz



5Ghz~




Yeah I know the cpu speed difference is weak... but uh... I see gains guys, small gains but look at the usage... What the hayday mayday!
    
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post #2 of 14
I'm going to lean towards misplaced overclocking. Most benches show the 2500k being pretty much identical to a 2600k in terms of graphics performance. I don't think your CPU is bottle necking you. Keep an eye on your CPU usage too, not just the GPU. If your CPU is pegging at 100% than it's a more likely candidate.

If it's not, then, like most games, increasing CPU speeds have a diminishing return and OC'ing your graphics cards will net you the real performance gains.

[Edit] also note, that's a CPU clock difference of ~3% which won't make a huge difference normally, and is generally within the margin of error on benchmarking. Small OCs net small performance boosts. And if you re-run those benchmarks several times, you'll notice differences between runs that will be more than 3% in some benchmarks. You can't make that fine of a comparison on one run... or really at all for that matter - you won't see the difference between 60 and 61.8fps (which is a 3% difference) which makes them identical for all practical purposes.
Edited by CTRLurself - 8/2/11 at 10:02am
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post #3 of 14
Well clearly since your GPU's are not pegged at 100% usage your CPU must be the bottleneck right?Must be time to step-up to the big leagues and get a SR-2!

All kidding aside....try using something other than Crysis for analyzing results,we all know it suffer's in SLi/Crossfire and clearly this is a software related issue.Also knowing what CPU usage is like during the runs would help just a liiitle bit,try coretemps logger.
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post #4 of 14
There's no way tha a 2500K @ 4.8 or 5GHz bottlenecks two GTX470 @ 850MHz in Full HD res..

1. Vsync? (should be OFF)

2. Any option forced through nVidia Ctrl Panel?

3. VRAM bottleneck? (only 1.2GB per GPU is nothing for Crysis 2 DX11,Ultra,HighRes @ Full HD)..

4.Driver issue..


NOTE that my Q9550 @ 3.5GHz is enough to max out a GTX480 (850/1025MHz) GPU @ 99% in Crysis 2 DX11,Ultra,HighRes at such low res like 1280 x 1024..


CHEERS..
     
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post #5 of 14
Thread Starter 
Thoughts?

    
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post #6 of 14
Not enough RAM?

Maybe Crysis2.exe cannot map the rest of available RAM for some reason and uses HDD which hinders performance?

CPU is not the issue 100% here as usage is barely @ 50%..


CHEERS..
     
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post #7 of 14
Thread Starter 
You're assuming Crysis 2 can use all 4 cores @ 100% though.

I could be a vram limit, but single card doesn't have this issue - same amount of vram.

MCU load during gameplay isn't higher than expected, around 32% load on it.

Would the paging file being slower cause less gpu usage but no difference in cpu load?
    
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post #8 of 14
Quote:
Originally Posted by BallaTheFeared View Post
You're assuming Crysis 2 can use all 4 cores @ 100% though.

I could be a vram limit, but single card doesn't have this issue - same amount of vram.

MCU load during gameplay isn't higher than expected, around 32% load on it.

Would the paging file being slower cause less gpu usage but no difference in cpu load?
It certainly can use more than 50% on SB CPU usage (have seen it happen @ 4.5GHz with a single GTX 570 @ 850Mhz )..

Yup MCU is ~ 30% on my rig too..

Could be VRAM as on my GTX480 it uses all 1.5GB available @ 1280 x 1024 res..

If performance is OK (FPS wise) no dips and lag then I would not be worried at all,also use 3 loops in benchmark as 1st one is always a bit odd..

CHEERS..
     
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post #9 of 14
The 2500K isn't feeding you 470s to the max even though it's close. It's still a bottleneck in this case. Your benches are solid proof for that

You could explore the matter even more by running the CPU at *apologizes for bad language* stock. You should get even less GPU usage that way.
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post #10 of 14
He could run his GTX470 @ stock and if GPU usage improves then it's some odd CPU bottleneck..

But honestly I have seen a Ci7 920 @ 3.9Ghz maxing out two Palit Sonic Platinum GTX570 in Crysis and Crysis 2 @ 1920 x 1200..


CHEERS..
     
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