Thanks a lot for your answers, it's helping.
Well now I have another issue, it seems the tab "miner status" doesnt show anything anymore when i click on it...
https://framapic.org/YuR729YQcbpc/rheIg0GxNH6m.png
Is it just the pool isnt configured well or something else? I m a bit worried i harmed the miner by putting the frequency to 750.
Thanks