You disable it in Windows, not Opera.

Thank you very much for helping me. Hope your dreams come true
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Peace!

Hello, My Name is Rapan Cristian and i don't know where to go to disable that sound whenever i get a notification.
I have installed the last opera version : 28.

I am very noob user when it comes to searching for things it will be very helpfull if u guys can use a screenshot program like imgur/ gyazo and show me where to go.

Sincerely, Cristian.

Hello, My name is Cristian and i experience some problems while running Opera 26.
My gpu is a gtx 970 and while i am browsing with opera the clocks are set to max
http://i.imgur.com/spglJyL.png .

I have disabled hardware acceleration. http://i.imgur.com/BS8A2ls.png and still have the same problems.

If i run other browsers like chrome i do not have the same problem and the gpu is running at low speeds and cool. http://i.imgur.com/Lhe35Sf.png

Help?