The Tech Report learned quite a bit about Mantle at APU 13, focusing much more deeply on what Mantle is and how it will work.  To think of it as a replacement for DirectX is a good start as it is an API but it also changes how your system interacts with your GPU.  The briefing delves into to the technical side, describing the context-based execution model which Mantle uses to give you proper access to assign tasks to multiple processors or other resources as the memory interface is also completely revamped.   There are four pages describing Mantle for your reading pleasure here and with the strong early adoption it would be worth your time to learn more about it.

"At its APU13 developer conference in San Jose, California, AMD invited journalists and developers to listen to hours worth of keynotes and sessions by Mantle's creators and early adopters. We sat through all of it—and talked to some of those experts one on one—in order to get a sense of what Mantle does, how it will impact performance, and what its future may hold."

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