So, I have the GPUs that I really wanted and they work beautifully at full resolution (8100x1600) for me.
 
I'm using the latest drivers (275.33) and they seem to work great.
 
I want to try and overclock the GPUs but haven't come across any threads/posts about OC'ing the GTX-580 3GB models.
 
I tried doing it on EVGA Precision and moved the slider to 832MHz Core Clock and the Memory Clock to 2050MHz from 2004MHz (stock).
 
I tried to run 3DMark Vantage and Unigine Heaven 2.5 and both froze and I had to hard-boot the computer. It is running at stock clocks now but I want to OC them get the best performance out of the cards.
 
Can someone help me with this?
 
Thanks.

Any Luck on the Overclocking?

I love EVGA's forum's; I read that 1.088 v is the 'safe' voltage (from an EVGA employee) cause that is what some 580's naturally come at. With that voltage I got my 3gig 580 at 883 and 1049 on the mem. Safe and doesn't void the warranty.

Did you get that from EVGA? Let me know so I can squeeze al little more. 1.088 v is the high range of what these cards come in.

lol.. ancient thread!
 
On the note of OC'ing my GTX-580, I am able to 3GB GTX-580 to 965MHz @ 1.15V and the max temps at full load is 68C. It's benchmark and game stable as well! :)

Was able to get 946 stable core with 1.15! Thanks! The memory dosn't OC much but so what.

I been playing Battlefield 3 for hours at a time ( I think 6 in a row is the most so far)- stable enough. I use Furmark Extreme burn in and Unigine (about an hour each). 
That said, I normally load the normal profile anyways now- no need to OC right now cause nothing really maxes it out completely yet anyway- I just wanted to see. Same thing on the CPU. On H2O but back at stock speeds.

Have you increased the voltage?

My 3GB (not classified) cards would only reach 840 on stock voltage, which I think was 1.018.
I raised them to 1.05 to get 865.

CIGARJOHN

My system crashes at 965 for some reason. Don't know why?

(2) GTX-580 Classified Hydro Copper - 855 - 3Gig - SLI

Hi
My GTX580 3gb Hydro Copper 2 says stop at 965 as well, was hoping to get 1000.
 

Are you sure those voltages are correct?
Stock on my 580 3GB was 1.018, not 1.18.
Also, don't OC the memory. Leave it at stock which I think is 2004.
Unless your talking about the classified cards, those are different.

I use MSI Afterburner and it's as simple as just moving the slider over to the desired voltage. Although, the latest version of Precision has been released to allow voltage adjustments.
 
I have my cards set to 1.05 which give me 865MHz on the core clock. I don't touch shaders which is linked to the core clock, and I couldn't touch the memory. It would crash even with a 10MHz bump.
 
My impression is that 1.10V and below is a good 24/7 overclock. I choose 1.05 just to be uber conservative and I can still run BF3 in Ultra @ 2560x1600 at 60FPS.
 
I choose to run Unigine Heaven for a couple ours to test my OC. I've had EVGA OC Scanner and 3Dmark11 run fine only to crash Heaven. So I just stick with that now.
 
At 1.10V I would start with 900MHz and run Unigine Heaven.
If it runs for at least 30 minutes, raise it 10MHz and repeat.
Keep doing this until Heaven crashes.
Once it fails, go down 10MHz and run Heaven for at least 2 hours. I've had it crash after about an hour.

I own two GTX 580's in SLI and tried some overclocking.  I found it's simply not worth the hassle.  I've increased voltage and overclocked up to 875Mhz on the core and raised the memory speeds.  When benching on Heaven 3.0 I only gained 4FPS more than stock.   In games, the difference is negligible.  It only increased gpu temps and fan noise so I reset everything back to stock.  The only thing I OC is my CPU, it's at 4.7Ghz.