AFAIK, PCI bandwidth is 133MB/s (33MHz, 32bit), so if you have to transfer
data twice over PCI, you will hardly get more than 60MB/s. (Or maybe 68MB/s
if your overclock your PCI to 37.5MHz, what almost any device will still
accept.)
The specification allows for 67MHz PCI devices, but I don't know such SCSI
controllers, only AGP graphics cards (which have a trick to double bandwidth
again, resulting in 533 MB/s).
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