You don't need a special software but very few discs works at 8x.
The only 4x discs that works at 8x with this drive is:
DAXON.AZ1 4x DVD+R
YUDEN000T01 (revision 1 only) 4x DVD+R
CMC.MAG.F01 (revision 1 only) 4x DVD+R
Other 4x discs will only write at 4x.
8x DVD+R discs should also work at 8x of course