Speed only depends on how fast the internal SCSI bus and HD are since the CPU doesn't need to be bothered with SCSI transfers unlike with old IDE.
You should be able to do 1MB+ on most 68020+ systems, 8x cdr is 1.2MB/sec I think (150Kb/sec per X).

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Regrettably, data trumps your optimism. There's more than simple bus speed to consider -- there still is the question of driver interaction. Without SCSI Manager 4.3, burning faster than 2x is impractical. I am not speaking theoretically -- I have the coasters to prove it.