Since your running SLI, you should "sync" both cards in Afterburner. This way any changes apply to both cards.
As for your fan profile, since your cards appear to be getting nice temps...
Try a profile that sets 70-75% fan speed at 70c and see if the noise is OK.
Really bro, you bought (2) 580's... they are going to make noise if you want that kind of performance
and 83c at 67% fan speed is nothing to worry about whatsoever, although you could probably get them to run in the mid 60c range if you didnt care about the fan speeds.
Personally, I use headphones and run my fans at 85% for any temps above 65c (see my profile)
(I use the stock BIOS (no fan unlocker as that increases voltage) and my cards are both factory VID at 1.000)
Using the above profile, with fan min set at 50% (see my idle temps below)
Using a aggresive profile like mine, keeps the cards max temps very low running stressful benchmarks..
*Normal stock voltage from the factory ranges from below 1.000v to 1.088v
Since all cards are set differently at the factory, anything inside that range can be set without worry..
-->the only question is if its stable at a lower voltage.
<message edited by maniacvvv on Monday, September 19, 2011 10:02 PM>