http://www.gamezine.co.uk/news/formats/xbox360/xbox-secrets-the-truth-about-xbox-360-relaunch--$1305320.htm
Halo reach is the first game that uses the X engine.
"One striking difference was the inclusion of one-gigabytes of RAM.the extra memory can be used to properly test your game.
extra memory from the 512MB pool would have to be put aside to test their game engine. Developers could of course disable these test features in order to use this spare memory, but that would mean that they wouldn't easily be able to test their game.
Therefore, a certain amount of memory would be sacrificed for their retail Xbox 360 game; this could amount to anything from 20MB's to as much as 100MB's. However, with the new Xbox 360 kit, this is no longer problem, giving that memory back to developers for the first time since the Xbox 360's launch in 2005."
the engine in general is a new way to program for the 360, it takes full advantage of the 360's features and give the 20-100mb of RAM back to the devs, thex eninge takes advantage of the 360 like the edge engine takes advantage of the ps3. Sony gave to thier devs and 3rd party. The edge is just now starting to show some serious power with Kz2 and UC2. and Killzone 2 (kz2 the best looking console gameimo runs on a modified EDGE engine.)
I don't think we'll be seeing next gen for a while :) just fine by me this gen is just incredible.
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