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Little gains from overclocking - need help

post #1 of 11
Thread Starter 
I would be very gratefull to anyone who could shed some light on my issue, basically I an having a hard time with my overclocking through lack of a noticable increase in performance on a number of applications...........

My system is in my sig.......

The top card is very close to the bottom and when overclocked and stressed the top card can be about 15C hotter than the bottom hitting 75C, which the lower card never breaks 60C when running at 900MHz using the full +100mv, so im thinking of getting a new mobo to allow a reasonable gap for air flow.

Im getting crashes in unigene after about 3 runs, i think this may be the overclock becoming unstable once the top card hits 75C........

Anyhow im going to run a few tests here and show my scores with varying degrees of an overclock to show whats going on (or whats not more to the point)

Stock cpu and gpus
phyx on cpu

1. 3d mark vantage high preset 18,043 - gpu 19,432 cpu 12,842

2. furmark benchmark 1920x1080 - 8992

3. Heaven 2.1 highest settings 1920x1080 -fps 36.2 score 913 min15.5 max80.4

4. Intel burn test 39/40 gflops (133x21)

cpu @ 3.2GHz/1600 ram / gpus stock

1. 19,195, gpu 20,278 cpu 14,736

2. 9246

3. FPS 38.4 , SCORE 967 MIN 13.5 MAX 87.2

4. 45 gflops

cpu @ 3.8GHz (190 bclk) gpus stock

1. 20,062 , gpu 20,636, cpu 17,328

2. 9254

3. fps 38.6 , score 972, min 13.6 max 88.3

4. 54 gflops

cpu @ 3.8 gpus @ 850

1. 20,589 gpu 21,281 cpu 17,387

2. 9547

3. fps 39.8, score 1002, min 14.5, max 91.8

4. 39 gflops - ? (maybe power deficiancy??

So apologys for this lenglthly question and results page but im unsure as to why the increases are minimal, considering when my 5850 was overclocked i saw much higher gains

Im wondering why the gains are so insignificant, i should note that running cards at 900 ads little more, and the gflops rate remains erratic......going up and down with every boot up.

any ideas much appriciated
    
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post #2 of 11
ur overclock is not stable at all. You will need to give it more voltage to keep it stable at that oc or lower ur core back down or you could go the route of watercooling to bring down temps making it stable at higher clocks with lower voltage. It's not that much difference in voltage tho. btw, 900 core is high, you will need a ton of voltage for that, esp not under water.
 
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post #3 of 11
Thread Starter 
ok i understand there is a problem somewhere, but as far as stability testing goes its all rock solid under all of the tests ive run above, 20 runs using max memory , however the behaviour in gflops can be erratic - is this a sign of instability in its own? the cards also run stable but with little increase in performance............is this due to heat? lack of power? im only running a 650watt psu
    
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post #4 of 11
Thread Starter 
Bump for being totally stumped, should I not be seeing higher gains from overclocking my cards?
    
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post #5 of 11
What is stock clocks on your graphics cards and CPU?

It would help a lot if you could lay out those numbers in such a way that I don't have to look all over the page to try to make comparisons.

A layout like this would be infinitely easier to digest as a reader/potential helper

Vantage High:
CPU@2.8, GPU@650/1700: X gpu score, X cpu score, X overall
CPU@3.2, GPU@650/1700: Y gpu score, Y cpu score, Y overall
etc ...

I would like to help, but I dunno stock clocks on your parts offhand, and it's just too much work to analyze the results the way they're laid out.
    
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post #6 of 11
Quote:
Originally Posted by Juliancahillane View Post
Bump for being totally stumped, should I not be seeing higher gains from overclocking my cards?
Just so you know, if an overclock is not stable, it will yield lower results than lower clocks that are stable. If you're getting a lower score as you overclock it is not stable and you'll need to increase the voltage. If this isn't possible you'll have to settle for the lower clocks. Heat dissipated does not affect the performance of the card as long as it's within the safe range (under 100C for your card).

Check out my overclocking log in my signature. You could make something like I did using Notepad to determine which clocks suit your card the best. Take your time to find the clocks your card likes, every card is different.
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post #7 of 11
Thread Starter 
thnks for the input guys , i actually started re writing that first post as requested but im having trouble with my highest i5 overclock, heres where i am soo far:

ok sorry heres a better attempt
was trying to multitask earlier and failed miserabley
modified a few things slightly

vantage high preset total cpu gpu

cpu @ 2.66 stock gpus(811) = 18,043 12,842 19,432
cpu @ 2.66 oc gpus(850) = 18,328 12,700 19,883
cpu @ 2.66 oc gpus(900) = 18,947 12,739 20,729

so a 900 mhz overclock gets me 1200 more points with the stock cpu


oc cpu @ 3.2 stock gpus(811) = 19,195 14,736 20,278
oc cpu @ 3.2 oc gpus(850) = 19,570 14,720 20,778
oc cpu @ 3.2 oc gpus(900) = 20,065 14,407 21,559

only 1,300 more, but about 800 higher overall than with stock cpu (looking at gpu score)

oc cpu @ 4 stock gpus(811) = 20,110 18,029 20,529
oc cpu @ 4 oc gpus(850) =
oc cpu @ 4 oc gpus(900) =

so raising the cpu allows the cards to operate a little faster
now i begin raising the gpu clocks to see what increases I get
Ive included 900MHz this time using +100mv

give me time to get this finished. I noticed a little burn in on my new plasma from using the pc on it, its gone for now but im slightly aprhensive of using it for another few days.

I just seem to get everthing stable, then ill run a benchmark, adjust my cards voltage for the 850mhz run ,checks again before i run vantage and the gflops had went from 54 down to 39. thats why i think I may have a power supply deficciancy. From what ive read over on tweak town theres ony 10% performance to be gained running 900 up from 800 odd anyhow, just thought the gains should have been higher. Check the tweaktown gtx460 sli article about the gainward glh edition. the performance preset goes from 30,000 up to 33,000


edit: this forum doesnt like my paste fromword pad its squashing figures, and the total cpu gpu part
Edited by Juliancahillane - 1/18/11 at 9:33am
    
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post #8 of 11
your total score seem reasonable but try giving more voltage for stability.

this is my score with gtx 460 hawk(not talon attack) SLI

http://3dmark.com/3dmv/2820637

notice my CPU score is lower, so your i5 is miles ahead.
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post #9 of 11
For stress tests try Metro 2033 benchmark and heaven dx11. Sometimes these programs find instability better than furmark or OCCT.
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post #10 of 11
In your analysis of what's happening, you want to get out of the mindset of looking at raw numbers, and start calculating percentages. Look at everything in terms of percentages. And don't look at 'scores', you should look purely at FPS here.

GPU OC scaling when OC'ing the core alone is usually on the order of 70-80%. If the memory is also OC'd by the same %, you should expect 80-90% scaling.

To give you sample numbers here, say your GPU core was at 1000MHz, and you got 100FPS average on Test A. Then you OC'd your core to 1100MHz (+10%), you should expect your FPS on Test A to rise to 107-108 (this reflects 70-80% OC scaling I referred to above). If you also raised your vram clocks + 10%, you'd probably get 108-109fps.

These scaling %'s I'm talking about are rough numbers and will depend on the tests, settings, etc. Higher CPU clocks may also help provide slightly better OC scaling on the GPU, for fairly obvious reasons. In fact, I'd say that if one was to see significantly lower scaling % than 70% from a core OC, there's a reasonably high chance that this would be due to a CPU bottleneck.

If you want to properly analyze effects of CPU overclocks in and of themselves, you should probably run some dedicated CPU tests (things like super-PI or whatnot), and not read too much into something like the Vantage CPU score.

Talking about CPU clocks here really complicates this whole discussion is the truth, because I'm not even sure what it is you're saying that you think is 'the problem'.
Edited by brettjv - 1/18/11 at 11:37am
    
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