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yosemite upgrade, or not


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Well, you'd actually be very ill-advised to attempt upgrading to Yosemite!


OS X  does not support Intel GMA950 graphics beyond Lion 10.7.5 and such support is limited to 32bit kernel mode. From ML, no drivers for obsolete Intel GMA graphics controllers and kernels+kexts are all 64bit only.


So the most recent OS X version that will run with full hardware support on your D520 is:

  • Lion 10.7.5 (in 32bit kernel mode) if you have a 64bit Core2Duo CPU
  • Snow Leopard 10.6.8 (in 32bit kernel mode) otherwise
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