After much speculation and hints from developers testing the forthcoming OS X update, Apple has posted a list on the Mountain Lion page of its website exactly which models are able to upgrade to version 10.8, which is coming out later this month and will sell for $20 exclusively through the Mac App Store. The new version of OS X relies even further on solid video-card specifications, which mean some economy models and other Macs from recent years may not be qualified to update.
