Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
XAA, or the XFree86 Acceleration Architecture, is over twelve years old and finally in 2005 it was greeted by a replacement, EXA. EXA was designed to offer speed improvements over XAA by accelerating more options and enhancing X's RENDER extension. Depending upon the driver, it wasn't until recently though that EXA really did have some modest speed advantages. A new acceleration architecture has now joined the mix. Intel's Keith Packard has announced UXA, which is short for the UMA Acceleration Architecture.
It seems as of late whenever we bring up Intel and X.Org together, something always relates back to GEM (even X Server 1.5 losing DRI2 support). This new acceleration architecture is also coming because of GEM. For those that have yet to hear of GEM, it's an acronym for the Graphics Execution Manager that is Intel's kernel memory manager for graphics and came because of a falling out over the TTM memory manager.