Found this thread at cdrlabs: http://www.cdrlabs.com/phpBB/viewtopic.php?t=13686
Norcent 8x DVD+RW/DVD-RW & CDRW part# DWD840-N
General Features:
Beige bezel
8x CLV maximum write speed (DVD+R, DVD-R formats)
4x CLV maximum write speed (DVD+RW, DVD-RW formats)
12x CAV maximum read speed (DVD-ROM single layer)
8x CAV maximum read speed (DVD-ROM dual layer)
6x maximum read speed (DVD+/-R, DVD+/-RW)
40x P-CAV maximum write speed (CD-R)
24x P-CAV maximum write speed (CD-RW)
40x CAV maximum read speed (CD-ROM)
E-IDE/ATAPI interface
2 MB buffer
140 ms Random Access Time (typical)
Horizontal installation only
Supported Read Formats:
DVD Single/Dual Layer
DVD-R
DVD+R
DVD-RW
DVD+RW
All CD-ROM/R/RW formats
Front Panel Features:
Headphone jack
Volume control dial
LED activity indicator
Eject/Load button
Emergency eject hole
Rear Panel Features:
Digital audio connector
Anaglog audio connector
Device jumpers
IDE interface
4-pin power connector
fs
Retail Package Includes:
8x Dual Format DVD+/-RW and CD-RW drive
Piece of 4x DVD+RW media
Sonic MyDVD
CyberLink PowerDVD
Analog CD-Audio cable
Mounting screws
Mounting instructions
Already in stock in some stores in the US 
Hm, do I smell a possible overclock for the LDW-811S to support 8X DVD-R and 4X DVD-RW? 
Strange that there is no words about this model at Lite-On yet (LDW-812S maybe?).
