http://www.apple.com/powermac/specs.htmlOptical drive bay with SuperDrive (DVD-R/CD-RW) installed; writes DVD-R discs at up to 4x speed, reads DVDs at up to 8x speed, writes CD-R discs at up to16x speed, writes CD-RW discs at up to 10x speed, reads CDs at up to 32x speed
If my memory serves me correctly, the DVR-105 only burns CD-RW's at 8x, but the new DVR-106 burns CD-RW's at 10x, as well as DVD+R at 4x and DVD+RW at 2.4x. Just an observation.