You have to download the OS X Extractor, you will find everything inside what you need.
I have x3100 as well (MacBook3,1), i think it is fairly smoothly running. Youtube is working as well (I use html5) and 720p is running smooth, but i think you have to turn off the annotations in the videos.
QE/CI is unfortunately not running, so that means, for example Sketchbook won't run on the computer because of the lack of QE/CI support. I think neither Photoshop and Illustrator, but I didn't have opportunity to install yet.
Transparency neither works!
Sometimes my macbook feels like it is running faster than ML #
Thanks for the reply, Macrozix.. The reason I asked is there are way too many versions of the alleged 64bit graphics kexts for X3100.. all those are possibly modded versions of a beta from a 10.6.2 update.. If your X3100 card seems to playback smooth videos (even without QE/QI), could you please upload these 5 files from your Yosemite installation, please?
AppleIntelGMAX3100.kext
AppleIntelGMAX3100FB.kext
AppleIntelGMAX3100GA.plugin
AppleIntelGMAX3100VADriver.bundle
AppleIntelGMAX3100GLDriver.bundle
I've been trying all of OS X 10.8/10.9 & 10.10.. There are minor issues with each versions installed.. brightness controls don't work, or lid switch not enabled (doesn't sleep when screen closed), wifi issues, graphics not fully accelerated etc..
Would you know how to enable brightness buttons to actually change brightness on ML10.8.5 on MB3.1? ML native kexts seem to detect the +/- buttons, screen shows the 'sun' logo but actual screen brightness doesn't change at all..