In a rare move, Apple has updated its Mac iMovie application
to expand its compatibility with some older video cards, and now lists its only system requirement as being "OS X 10.9 Mavericks," suggesting it has dropped the previous requirements for "an OpenCL-compatible graphics card" and "a display with 1280x800 resolution or higher" as strict requirements (though they are likely still recommended). The move could allow some Mac models that can run Mavericks but don't have OpenCL-supported cards, or have added third-party cards, to run the latest iMovie.
Apple has not specified precisely what it means by "older video cards," but examples of computers that can run Mavericks but don't have OpenCL-compatible cards include the 2007 iMac (mentioned in the keynote as one of the oldest models that can run Mavericks), and some MacBook models that only have Intel video chipsets rather than a discrete video card.
In addition to the compatibility change, the update also "addresses reliability issues when updating projects and events from previous versions of iMovie." This is the first update to version 10 of iMovie (though it is frequently called "iMovie '13" after the year in which it was released, as previous versions were), which was introduced alongside the debut of OS X Mavericks.
The 10.0 update made many changes, offering a more streamlined UI design; the "iMovie Theatre" and trailer-creation tools of the iOS version; new title styles, trailer templates and movie themes; the ability to use still photos in trailers rather than only video; direct trimming of audio and video in the timeline; more advanced shadow, highlight and color fixing; support for iPhone 5-esque panoramic photos; much-improved support for AVCHD and improved performance on 64-bit machines among other changes.
The 10.0.1 update is available through Software Update and the Mac App Store. The software is free for Mavericks users as well as those buying a new Mac product, as is the iOS version for iOS 7 upgraders or those who have purchased a new iOS device.