BCC Hardware posted a review on the Plextor PX-760A DVD burner

DVD-ROM drives have been around for many years, and when 16x drives came out the promise and hope of reading and ripping DVD's at faster speeds was thrilling. My first 16x DVD-ROM was a Toshiba drive and it rocked. 16x is the fastest speed we've seen for years, and with spindle speeds of over 9,000 rpm and data transfer rates of 22.16MB/sec, the ATA33 bus is getting pretty limited. DVD Writing is another story. I received my first 4x DVD+R drive back when 4x writing was "blistering" fast. We've seen the gradual increase in maximum writing speeds, but these speed increases yield diminishing returns. While 8x is almost twice as fast as 4x, 16x drives are not twice as fast as 8x drives.

Plextor PX-760A - 18x DVD-RW Review