Got 2 580 3Gb in SLI ..what a safe 24/7 oc?

[barjoysee]

Got these not long ago for B3..
I have two EVGA Geforce 580's 3Gb in SLI they have EK waterblocks fitted running on a I7 920 @ 4.0Ghz 24/7 oc for now I have overclocked them from the default clock of:


To this Clock:



the same as the classified 3Gb Cards

Whats a safe 24/7 overclock for these cards I'm not looking to get benchmark gains just better everyday performance in games. As even with 2 in SLI I have seen them go down to 22 Fps in Battlefield 3 in strike at Karkland map with motion blur off and HBAO off at 2560x1600

Barjoysee

 

[Rroff]

THe MHz don't really matter its the voltage and heat that are the killers, theoretically you can put about 1.4v through them if you can keep them under 80C giving atleast 5 years mean life - in practise I wouldn't want to bet on that tho and anything from about 1.1v upwards is considered a little risky.

If your running stock voltage pretty much any clock thats stable where you can keep temperatures <90C or so will be no problem at all.

 

[barjoysee]

AVP Benchmark gained me about 7fps more then 30Secs into BC3 and full hardware lock ?

Never added anymore Voltage ..couldn't see were too or do you do this in the drivers ?

 

[barjoysee]

or do I need to get Rivatuner ?

 

[Rroff]

You will need MSI Afterburner to adjust voltages and I'd research those a bit as they are much more likely to kill the card than adjusting the clock speeds will do.

 

[Mariusz]

With the spec in Sig running two 580 gtx 1.5gb in sli i've got the core running at 900mhz using 1.1v, haven't played about much with the memory speed.
I use MSI Afterburner to overclock with a profile for 3D applications.
Haven't had any problems in games, Battlefield 3 runs great at 2560*1600. Depending on how fast I run the fans on my radiators temps hover in the 40's.

 

[barjoysee]

You will need MSI Afterburner to adjust voltages and I'd research those a bit as they are much more likely to kill the card than adjusting the clock speeds will do.

Thanks Roff !... got afterburner I noticed it says 1013 rather than say 1.1 is 1100 the same as 1.1 ? as the max is 1150 ? see pic


Don't want to push them if it kills them all o/c have fauled on b3 at so far..

With the spec in Sig running two 580 gtx 1.5gb in sli i've got the core running at 900mhz using 1.1v, haven't played about much with the memory speed.
I use MSI Afterburner to overclock with a profile for 3D applications.
Haven't had any problems in games, Battlefield 3 runs great at 2560*1600. Depending on how fast I run the fans on my radiators temps hover in the 40's.

What sort of frame rates have you been going down to Mariusz ? I know it can use your 6 cores and it likes more than my 6Gb memory !
In most maps I have been down to 35-40 fps which isn't great considering I'm using 2 3Gb 580's and I'm not even on may settings !
I've even seen 22Fps on stike at karkland !!!

 

[Rroff]

1.1volts would be 1100mV yes.

 

[Paddy McGinty]

The gigabyte 580s start at 850 core clock,there better than the evga ones.

 

[Mariusz]

What sort of frame rates have you been going down to Mariusz ? I know it can use your 6 cores and it likes more than my 6Gb memory !
In most maps I have been down to 35-40 fps which isn't great considering I'm using 2 3Gb 580's and I'm not even on may settings !
I've even seen 22Fps on stike at karkland !!!

I see north of 60 fps, like it to stay above my monitors refresh rate. Only time I saw lower than 30 was when I first got monitor and i tried to run game completely maxed out with same settings that I used at 1920*1200. I ran out of Vram and frames plummetted, had to drop a few settings to get frames back up, can't notice difference though.
With 3gb of Vram you should be fine, your i7 920 shouldn't hold you back, the game doesn't scale with quicker CPU's it's GPU bottlenecked in benchmarks I've seen.
Overclock your cards as far as your comfortable with, makesure you've got latest drivers and then have fun playing the game

 

[Locky]

Best think to do is increase the voltage in stages, stay at 850 core and 2.1 memory and increase the volts until it's stable in everything you play. There is no point is going straight to 1.1 as it prob doesn't need that much.