Some Macs have only one Thunderbolt bus (e.g. When/if more simultaneous read or write bandwidth is required, you still must use another port on a separate Thunderbolt bus for devices that must have full bandwidth simultaneously. For example, reading at maximum speed from one device to write to another device is not a problem as there is 64Gpbs available in total, 32 Gbps for writes and 32 Gbps for reads. However, for most users it is rarely the case that all peripherals are demanding bandwidth at the same time*. Thus, with a single Thunderbolt cable from the computer to a Thunderbolt hub or Thunderbolt dock or other device, the total data bandwidth is still limited to 40 Gpbs (total of display and data bandwidth, max of 32 Gbps for writes and 32 Gpbs for reads, bidirectionally). $130 OWC Thunderbolt Hub in All Other Categories
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