Hello, i would like to know if is safe to adjust the sliders in CCC in AMD overdrive to 840MHz instead of 800 and to 1325 MHz instead of 1250. These are the maximum values for this card and has dual fans so i was wondering if that simple way of o/c would be possible without complications. My fan speed btw is @ 35%
Well, you can. However, you need to figure out if this overclock is stable. The heat is not the only thing to consider when overclocking.
What you want to do is download 3dMark 11 and run the free version in performance mode. If the card can get through the entire demo without errors, then its safe to say that overclock is stable. If it cant, then you have to go push the sliders down and keep testing until you get it stable.
One thing to note: Go ahead and give the card the extra 20% power boost. Slide it all the way to the 20% for any overclock, that will make it more stable as well.
Overclocking is never 100% safe but usually stability goes down before damaging. Do not take over 900 mhz on your first try. increase 10-20mhz and tes it using furmark / atitool or 3dmark if ok go another 10-20 if it loses stability take it back.