Hi @mobile4,
Please fix HD3000. Cause Firefox and Safari work with it without any problem.
The current edition of Opera Developer features software video decoding support for MSE, which should solve your video problem. If all goes well, this will reach the stable version of Opera in the near future.
Opera has to check on how many and what kind of video cards are in system. And switch between it in auto mode or, at least, ask a user for switching. Some native Mac apps (such as Apple Photo for example) turns on discrete GPU instead of build-in when they are started.
Opera knows how many video cards are in the system, and switches to the discrete GPU whenever a page with WebGL or accelerated canvas is visited. In Opera 41 (current beta) and newer you'll have the ability of controlling this feature via a preference. Also coming to stable in the near future.
If you want to try out Opera Developer (this is an unstable version of Opera with new features being tried out, installing it doesn't affect your main version of Opera), see http://www.opera.com/blogs/desktop/ , otherwise you can of course wait until these feature reach the stable version.
