Overclocking limits

[tres_kun]

I recently got the
MSI Radeon R9 280X Gaming Edition OC
on 25 december

And wanted to overclock the card a bit but on GPU i have little experience

The card comes on 1020Mhz clock
So got MSI afterburner and i cant unlock voltage control no matter what
I also got Msi kombustor to stress the card for stability
So i started the fun
Got to 1170Mhz on the gpu with 18% power target but the card was overheating at 80 degrees with 100% fan there were small artefacts from time to time
At this point i opened the window and stopt
Running perfect at 1140Mhz with 10% power target 76 degrees window open

On the memory i was able to go to 1720 Mhz with 5% power target 1740 Mhz will work only with 10% power target

So got to combine the outcome 1140 Mhz on gpu and 1720 Mhz memory 16% power target at 76 degrees window open

What is the maximum i should run the card 24/7 ?
1100 Mhz GPU and 1650 Mhz Ram how does it sound?

 

[tres_kun]

i read about the card
And it was overclockeat with voltage increase
But how do you enable that in msi afterburner
I went in the configuration file and modified but it will not give me control
It even tells me the message that i understand the risk of going over the cards parameters but no voltage control

Edit: the card does not go over 70 degrees in games
Was playing Call of Duty Ghosts fan spinning at 60% temperature 67 and the card had the OC to 1140 on the coor and 1700 on memory GPU usage 100% and 50-80FPS
Maybe i should take it further but i will not this is enough for me