The Ultra3 SCSI variants represent yet another doubling of SCSI bus speed, to 80MB/s and 160MB/s for the Narrow and Wide variants, respectively. As with Ultra2 SCSI, however, Ultra3 devices are available almost exclusively in Wide format, which is often referred to as Ultra 160. In fact, 160MB/s exceeds even the theoretical maximum 132MB/s transfer rate of a standard 32-bit PCI bus, so some Ultra3 host adapters use 64-bit PCI busses rather than the more common 32-bit variant. Be sure you can use such a host adapter on your motherboard before buying one.
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