Even if the SCSI hard drives and NCR SCSI controller can do 10MB/sec it's not realistic to expect that kind of performance from Zorro3 DMA.
Super Buster is a "Bottleneck" which limits the band with of individual Zorro bus masters for the benefit of all bus masters... and if this weren't enough Zorro3 bus arbitration runs at the good old Zorro2 clock speed of 7 MHz.
In fact, most Zorro3 slave cards which don't have to arbitrate the bus barely manage to achieve 10MB/sec!
