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MSI GTX 580 Lightning Overclocking

post #1 of 23
Thread Starter 
I've been trying to get the most out of my GTX 580 Lightning on air. It seems I've hit a wall at 930MHz core. It's rock solid stable at 930MHz using +60mV (1.11V). However, I can't get anymore FPS at higher speeds. No matter how much more voltage I give it (up to +200mV core and +50mV pll), it won't perform any better.

Have I hit it's max speed? How would I know if I was hitting the current limit? Do I need to disable OCP?

I haven't messed with any of the dip switches yet.
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post #2 of 23
Quote:
Originally Posted by compudaze;13446853 
I've been trying to get the most out of my GTX 580 Lightning on air. It seems I've hit a wall at 930MHz core. It's rock solid stable at 930MHz using +60mV (1.11V). However, I can't get anymore FPS at higher speeds. No matter how much more voltage I give it (up to +200mV core and +50mV pll), it won't perform any better.

Have I hit it's max speed? How would I know if I was hitting the current limit? Do I need to disable OCP?

I haven't messed with any of the dip switches yet.

I got my EVGA GTX 580 at 1.1v clock to reach @ 912 core 3D Mark 11 bench with an i7 950 3.5Ghz OC to give me a 6902 score. Anything I tried to reach higher went unstable.

Under water 1Ghz is possible.

On air if you reached @ 930 core it's a true testament on the cooling difference of the Lightning series. Their claims that the card runs at 20C cooler really did help you reach that higher clock.

In short, yes that's the limit for the most part. Pretty damn good one to since you've pushed your card a good 20% better than stock in my opinion.
     
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post #3 of 23
If its not crashing..its not a temp limit.. If its not locking up and requiring restart- its not OCP.

It could be current limiting. Have you looked into OCP mods? They are usually easy..and may 'fool' current limiters/sniffers... Im sure others that bench these gpu's on DI/LN may even have a BIOS to get rid of such limiters.. ie- CHiL flash..? thinking.gif
post #4 of 23
Thread Starter 
There's a dip switch thats supposed to disable OCP that I haven't tried yet. I Noticed in Metro 2033 and Crysis WH i'm maxing around 400W from the wall. When I load up Furmark it goes up to 400-420W then drops to 360W and repeats.
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post #5 of 23
Quote:
Originally Posted by compudaze;13448138 
There's a dip switch thats supposed to disable OCP that I haven't tried yet.

sounds like you know what you need to do.. wink.gif

..your visibility at current draw confirms that it is a current limit. As I said earlier, actual OCP would lock the GPUv at ~0.3v and require restart/power cycle to fix. Im sure the switch disables the current limit as you as witnessing..just wanted to distinguish the 2x. Once you have removed current limit.. OCP mod will be your next step once you encounter issues at higher clock speeds.
post #6 of 23
Thread Starter 
Didn't seem to matter. Perhaps I've maxed it out on air. I guess I should be happy with 930 core.
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post #7 of 23
MSI GTX580 OCP mods ..just need a dab of solder on 2x resistors..
post #8 of 23
Quote:
Originally Posted by CL3P20;13448603 
MSI GTX580 OCP mods ..just need a dab of solder on 2x resistors..

Warranty sniper.gif
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post #9 of 23
I have RMA'd to MSI with mods still attached before redface.gif

..besides.. you can pencil these if wanted, all you are doing is lowering resistance. Shorting with solder removes OCP altogether.. lowering resistance [with pencil or VR] to ~2k ohms will set OCP to something like +35% or more of its current limit.
post #10 of 23
Thread Starter 
Just wanted to make a note here in case anyone else stumbled on this thread.

In Crysis Warhead/Metro 2033 I seen no performance increase above 930MHz core. Memory didn't make much of a difference either. I was able to pass a 99x loop Crysis Warhead stability test at 930MHz core using 1.11V (measured, +62mV in Afterburner).

In 3DMark 11 I seen a constant ~50 point increase in my graphics score every 10MHz in core speed up to 970MHz. I couldn't run 3DMark 11 past 970MHz core.

In 3DMark 11 I seen a constant ~10 point increase in my graphics score every 25MHz (Afterburner, 12.5MHz GPU-Z) in memory speed up to 2450MHz (Afterburner, 1225MHz GPU-Z). I couldn't run 3DMark 11 past 2450MHz (Afterburner, 1225MHz GPU-Z) memory.

For the 970MHz 3DMark 11 run I went up to +100mV. It was just barely stable enough to finish the run. No matter how much more voltage (Core or PLL) I gave it, it wasn't any more stable at this speed nor could I run past 970MHz core. I had a much higher chance of completing the run if I let the Temps reach idle temps before starting the next run.

I believe if I could cool the card better (I.E. water), I may be able to squeeze a few more MHz out of the core for benching.
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Scorpion
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