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560 Ti vrm phases, voltage control, general OC questions

post #1 of 7
Thread Starter 
I have searched far and wide and have a few specific unanswered questions about overclocking my GPU.

Taking a look at the reference guide I posted which is from this article I have discovered that my 560 Ti (the one on the right and being the most basic reference version in that list) has some very similar qualities to it's big brother, right next to it.

The Sparkle Calibre X560 is the highest factory clocked of all of these and it seems to be identical to my card other than the cooler.

PCB version and VRM phases are the same. Can I assume that I can overclock this card to similar levels as the Calibre x560?

So far I have reached a stable overclock of just over 900 on the core, I belive at about 925 furmark gave me a black screen that I was able to recover from. (display driver error message said "too much work is being put on the GPU")

It was at 81C and 75% fan speed.

On the other hand, I am reaching fairly impressive heights on the memory OC.

Currently right at 2300 (DDR 4600) and 12 minutes into furmark at 1920x1200, 32X AA and post processing on burn mode. setting at ~80C.

I have tested 900/2285 in BF3 Beta and it is stable as a rock.

To sum the questions up:
what are "vrm phases?" (the Sparkle models having four and other 560 Tis having up to 7) (i researched that here but it was over my head)

Does this card have unlocked voltage control? I can select to unlock it in MSI AB but have not yet dared to touch the bar to see if I can.

And what is the testing process for voltage and overclock increase? My process has been 10-15Mhz steps followed by usually about 10 minutes in furmark (1920x1200 stability with burn/32x AA and post process.)

Do i step up voltage AND OC and then test? What incriments should be used?

Thanks for any help and as for temperatures burn tests MAX ever was 82C and in battlefield 3 it peaks at 66C.


/edit as of time of posting 2360 appears to be stable on memory with 900 core and stock volts. going to be interesting to see how far I can take this memory OC. 20% would be awesome!
/edit

Edited by civilian_pr0ject - 10/4/11 at 1:01pm
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post #2 of 7
Thread Starter 
a few games of battlefield 3 at 900/2375 proved flawless might be able to go a bit over 20% on my memory overclock!

and uh... bump for help on the questions about voltage...

gottta get that core frequency higher...


/edit moments after posting this bf3 crashed and display stopped responding but recovered.

I'm gonna pull the trigger on a voltage increase...
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post #3 of 7
Thread Starter 
bummmmp?
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post #4 of 7
Well, to start with, no two GPUs are the same. Just because that card got 1000, doesn't mean yours can. Power phase design is sort of irrelevant to a point. The 4+1 reference designed 560 Ti is more than enough for mild overclocking. I've got two reference 560 Tis (Both EVGA). One can do 1040 MHz, the other can only go as far as 990 MHz.

900 is about right with stock voltages. If you want to get more out of your card you need to increase your GPU voltage, then you probably can go higher with the clocks.

One of the easiest way of doing that is with MSI Afterburner. After you've installed it, go to settings and enable voltage control and voltage monitoring.
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post #5 of 7
Thread Starter 
Thanks for the reply. Maybe you can help me a step further... 900/2350@stock volts ran for 2 hours in Furmark on stability mode with burn testing at 1920x1200 with 32X AA and post processing, but in Unigine heaven it crashes my display driver in a matter of about 20 seconds. I tried upping the voltage to 1.05 and it didn't fix the issue. Next, I tried unigine at 900/stock memory and it still crashes soon...

I have a seasonic X650 80+gold psu... could it be that I have the wrong psu cables plugged in or something? Or running from the wrong ports on the psu?

edit::: the picture attached shows where my cpu and gpu are plugged into the psu

Edited by civilian_pr0ject - 10/4/11 at 7:42pm
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post #6 of 7
I doubt it's the power supply. Furmark doesn't work well with the 5xx series card as they have some sort of protection so don't bother to test the stability of your card with furmark. If it crashes on unigine, it probably means that it's unstable at the current clocks/voltages. You can safely ramp up the voltage to 1.15 on that card and it should be fine. For every day use though try to keep it under 1.1 as it gets real hot with stock cooling.

As for your current problem, keep raising the voltage untill Heaven becomes stable, then start to raise the clocks and if it crashes, raise the voltage again. Do this till you find the limit of your card.
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post #7 of 7
Thread Starter 
hmm... thing is... 900/2350 runs fine for hours in battlefield 3 and in furmark... the protection you are talking about is a feature that keeps your computer from shutting off during a graphics crash, and it does it for furmark when I go to far, for battlefield, and for unigine, except in unigine the crash is a little harder to recover from.
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