3 ms·

I can't remember where I heard this, so don't quote me, but I've heard it partially has to do with graphics kexts in some or all of those machines being 32-bit

by daed 15y ago

I can't remember where I heard this, so don't quote me, but I've heard it partially has to do with graphics kexts in some or all of those machines being 32-bit and a reluctance from Apple and the manufacturers (Intel, AMD, Nvidia) to update them. That said, I'm not sure how that would rule out the Mac Pro, then, because the chips I heard cited were the old Intel chips (950, x3100) and AMD chips (X1600). Again, don't quote me! edit: this assumes Apple is moving to 100% 64-bit.

bri3d 15y ago
This makes sense for non-Mac Pro machines, although so far it doesn't seem to be the case as Mountain Lion will actually run on those machines if they're added to SupportedHardware.plist [0]. However, in the case of the Mac Pro it's hard to see the restriction as anything other than arbitrary and frustrating. 0: http://osxdaily.com/2012/02/18/install-os-x-mountain-lion-developer-preview-on-old-unsupported-macs/ http://osxdaily.com/2012/02/18/install-os-x-mountain-lion-de...