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GTX 560 (Non-TI) Overclocking Limits

post #1 of 9
Thread Starter 
Hello everyone,

New to overclocking and to the community, and after attempting my first overclock the other day I was left with some questions.


That is where I am currently after attempting my oc.

The general process that I used was using MSI Afterburner, Kombustor, and GPUZ:
Started by no voltage change slowly bumped up core clock until about 1000MHz, where it became unstable and crashed, came back down to 950MHz where is was stable
Then I bumped up voltage, first to 1.01V, tried to get past 1000MHz couldn't, bumped up voltage to 1.025V still couldn't get it past 1000MHz (975 seemed to be stable)
Called 975MHz, 1.025V stable went to the memory clock, started at 2200MHZ, stable, bumped up to 2300MHz, stable
Finally called 975MHz core, 2300MHz mem., 1.025V stable
(Missing steps but hit the highlights to make this shorter)

During this entire process I never got above 61C, saw a +3fps on the initial bump up to 950mhz (no other changes) and then throughout the rest of the process i maybe got an additional +.5fps on top of the +3fps (total of +3.5fps overall).

So finally getting to my question, can I push my gpu higher since i wasn't hitting that high of temperatures? I used 1.025V and 2300MHz(mem.) as my limits because after researching I found that's about what other people seemed to be maxing out at. Also, I didn't push it beyond these limits because I didn't think that there was a need to since I was only getting a +.5fps

Let me know your thoughts or if you need any additional information. Thanks in advance!

SYSTEM:
i5 2500K
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115072

Asus GTX 560
http://www.asus.com/us/Graphics_Cards/ENGTX560_DCII_TOP2DI1GD5/

Gigabyte z68 mb
http://www.gigabyte.us/products/product-page.aspx?pid=3849#ov

sandisk extreme
http://www.newegg.com/Product/Product.aspx?Item=N82E16820171568

G.Skill ddr3 ram
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314
post #2 of 9
personally i think it is much better to use unigine valley to test for stability than kombuster.

all in all, i think you got it; keep raising the clock until crash then look at the voltage until you get diminishing returns. thumb.gif but some games will "eat up" your OC. there were several times i had to back down (or slightly raise the voltage) from what was stable in kombuster or valley when playing crysis 2 or far cry 3.

btw, heat is one thing but keep an eye on the voltage, that is the fastest way of frying your card. so don't go past what you see others get unless you are sure of yourself and the card.
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loon 3.2
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post #3 of 9
Thread Starter 
Thanks for the post!

So I'm thinking than that I just hit the limit for the card. Maybe?
post #4 of 9
it pretty much looks like that. i found a few (older) reviews that included some overclocking:

lets first look at the power design:
http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_560_TOP_Direct_Cu_II/3.html
the image @ the bottom is showing a 6+1 (6 for the gpu and 1 for ram) that pretty good but the voltage controller (on the bottom of the next page) is rather non descript and may not be the best. though to be perfectly honest i really am not an expert at that. but what i am saying is that power design looks much better than a reference or vanilla card.

techPU got a very similar OC as you did (~975):
http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_560_TOP_Direct_Cu_II/30.html
but i don't think they didn't mention the voltage. now legit reviews went full bore and achieved a pretty substantial OC of 1025 @ 1.087v
http://www.legitreviews.com/article/1679/15/

however, as you saw yourself there is a point of getting diminishing returns; if you want to keep the card for a length of time or planned on selling it when you upgrade i would suggest keeping the voltage lower than the legit OC results; higher voltage will degrade the gpu no matter how low the temp is. but if you were planning on throwing it into the trash bin when you upgrade in a year or so, then go for the max. devil.gif

however keep in mind since the keplar drivers, past 281.xx, fermi cards will throttle down when the clock speed is over 999Mhz. gpu shark or kombuster will show it, both are "bundled" with afterburner. now supposedly the latest drivers, 325.xx, is now allowing that. but i have not tested it with my 550ti - i can't get anywhere near 999+ on my 570. redface.gif

hope i made sense . .
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post #5 of 9
Have you run any benchmarks to see the difference in performance. Try running 3D Mark11.
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post #6 of 9
Thread Starter 
Jason,
Yea, I was running a variety of tests through Kombustor to see where I was at on stock and where I was at throughout the oc process.
The basic results were that I jumped right up to +3fps without changing the core voltage or memory clock but couldn't get it to go anywhere else after that really (got an additional .5fps with what I considered to be my max voltage settings/core clock/ memory clock)
Quote:
Originally Posted by jason387 View Post

Have you run any benchmarks to see the difference in performance. Try running 3D Mark11.
post #7 of 9
Thread Starter 
Looniam,

Thanks for all the help again. What you're saying is making sense and it's also what I am finding on my own. I just wasn't sure if I should go higher since my temp wasn't reading that high. I won't try to max it out as I plan to keep this card for a little while longer (being a broke student sucks).
Quote:
Originally Posted by looniam View Post

it pretty much looks like that. i found a few (older) reviews that included some overclocking:

lets first look at the power design:
http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_560_TOP_Direct_Cu_II/3.html
. .
post #8 of 9
Lets have a look at a 3d mark 11 score.
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post #9 of 9
Quote:
Originally Posted by jason387 View Post

Lets have a look at a 3d mark 11 score.

i am more of a unigine valley person but i agree with the logic; kombuster is a good "stressor" but a benchmark that uses more "ingame imaging" would be a better test of how much of a difference your OC is getting you.
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