Sony dual RW drives for the PC

Sony Electronics is building upon its leadership in the DVD-recordable market with a new generation of its Dual RW drives, the first combination drives for the PC to support the DVD+RW, DVD+R, DVD-RW and DVD-R formats.
The internal DRU-500AX and the external DRX-500ULX drives are capable of recording to both 4X compatible DVD+R and DVD-R discs at up to 4X speeds, offer enhanced software for mastering and drag-and-drop file management, and playback DVD recordable media faster than before.

Like their first-generation predecessors, the new Dual RW drives encompass four DVD recording formats for recording functionality and playback compatibility. By supporting all the popular DVD recordable/rewritable formats, the Dual RW drives allow computer users to transfer home movies from tape to DVD discs, customize and edit them for a personal touch, and then play them back in nearly all consumer DVD players and DVD-ROM drives without worrying about format variations.

Sony’s DRU-500AX and DRX-500ULX models are also the industry’s first to support both up to 4X DVD+R and DVD-R recording when using 4X speed media, making them among the fastest on the market. Users can now create write-once discs in approximately half the time of drives writing at 2X speeds.
Full info here http://www.cdrinfo.com/Sections/News/Details.asp?RelatedID=3303
 
I don't see any differences between my DRU 500A and the new DRU 500AX. Writing speeds are the same and also the software. The preview tells that this is the first drive to permit dvd-r and dvd+r 4x writing speeds, but also DRU 500A can make it.
 
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