Here is 8x burners speed specs table

[WH]

                            +r +rw cdr cdrw
HP 400i                     8x 4x  24x 10x
NEC ND-2100A                8x 4x  32x 16x
TEAC DV-W58E                8x 4x  32x 16x

                            +r +rw -r -rw cdr cdrw
Lite-On LDW-811S/LDW-851S   8x 4x  4x 2x  40x 24x
Memorex 8X4 Dual-X          8x 4x  4x 2x  40x 24x
OptoRite DD0401             8x 4x  4x 2x  40x 24x
Plextor PX-708A             8x 4x  4x 2x  40x 24x
Sony DRU-530A               8x 4x  4x 2x  40x 24x
TDK indiDVD 840G            8x 4x  4x 2x  40x 24x
TEAC DV-W58G                8x 4x  4x 2x  40x 24x

                            +r +rw -r -rw cdr cdrw
NEC ND-2500A                8x 4x  8x 4x  32x 16x
Pioneer DVR-A07/DVR-107D    8x 4x  8x 4x  24x 24x

                            +r +rw -r -rw ram cdr cdrw
LG 4081B                    8x 4x  4x 2x  3x  24x 16x