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GTX580 overvoltage dilemma.. no more than 1.038v

post #1 of 21
Thread Starter 
Hi guys,

I am trying to overclock my gpu, but i get stuck at 905 mhz at 1.038V. If I crank up the voltage (next step is 1.050V) and remain at the same core frequency (or higher/lower), the card seems to become sort of useless, as in:

-FPS drop in Kombustor
-Not a significant FPS increase while playing games
- and most important, while playing metro 2033, all max, 4xmsaa (as in full gpu-load) after a while I get a light-blue screen, and the pc dies.

Is this due to lack of power? Or just the voltage limit my gpu has? I can't believe it is its limit. At 905, everything is stable and games feel more stable in framerate, but when I crank up the voltage, it seems as though it simply can't deliver more power.

Temps are ok, just a mere 75-80 degrees celcius, depending on cpu load and internal case heat.

Many thanks in advance
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post #2 of 21
It could be the VRM or RAM. And FPS drop in kombustor is due to the Throttle kicking in
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post #3 of 21
Thread Starter 
And what is there to be done about the VRM? I don't think it would be overheated, right?
And it also happens when the ram speed is at stock.
What throttle?
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post #4 of 21
is the sparkle calibre a reference design PCB?

my max in MSI Afterburned is 1,138v
post #5 of 21
VRM can overheat and will if you apply too much volts. You can prevent it by adding small heatsinks on em or watercool your card.
The 580 has a power throttle thing built in designed specifically to prevent too much power going in. You can disable it though but your looking at another 100+w on full load with the card.
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post #6 of 21
Quote:
Originally Posted by kakakakaka;12392172 
Temps are ok, just a mere 75-80 degrees celcius, depending on cpu load and internal case heat.

This is your problem.
Kombuster is the same as furmark.
The card limits the power on these programs (as well as on OCCT).
You can disable it, but I don't recommend it (look for GPU-Z OCP 580 limit on google).

Also the card's temp limit is lower than its older brother the 480, meaning that at 85c, the card will throttle down to 2D core clocks internally.

If you already push 80+ degrees on air, stop.
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post #7 of 21
Thread Starter 
Well, I don't know if it's a reference model to be honest. In Afterburner the voltage goes to up to 1,150v. But I never got it higher than 1,038v, and I guess that's even between the nvidia standard range (when set as dynamic voltage). But maybe the cooling by Calibre isn''t done properly, maybe just the gpu-cooler replaced. I will check that.
And it doesn't throttle at temp, but at voltage. FPS drop in Kombustor even before i reach 80 degrees. Only when I volt it too much.

I have some small heatsinks left, from accellero, maybe I'll try those. And check my cables maybe. 1,038 v is nothing compared to what I see most people use when even starting to overclock.
Many thanks, don't know when I will try this. Maybe I will also buy better cooling paste, whilst removing it.
(don't know where to find the VRM to be honest, if anyone has a clue wink.gif I would be happy to hear that wink.gif )

Buhbye
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post #8 of 21
Voltage doesn't drop on its own.

What happens is that card throttles the memory and core down, so their power requirement goes down, and they generate less heat.

Also, just saying, kombuster isn't a good stability/load test for the 5xx series.
You want to test stability? Run 3dmark 11/vantage.
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post #9 of 21
http://www.overclock.net/nvidia/940239-gtx-580-overclocking.html#post12371615

Using a modded BIOS got me that little extra I needed
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post #10 of 21
Impressive results thumb.gif
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