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What are the actual speeds of the USB 3.0 products?

Transfer speeds vary based on the version of the Bus type (PCIe or ExpressCard), the adapter speed limitations (USB 3.0 for these products), and the device limitations used with the interface (USB 3.0 or USB 2.0). Match the type of Bus with the device type to see theoretical speeds:

Bus TypeMax Transfer RateUSB 3.0 Transfer SpeedUSB 2.0 Transfer Speed
PCIe 1.0a2.5 Gbps2.5 Gbps480 Mbps
PCIe 2.0/2.15 Gbps4.8 Gbps480 Mbps
PCIe 3.08 Gbps4.8 Gbps480 Mbps
ExpressCard 1.02.5 Gbps2.5 Gbps480 Mbps
ExpressCard 2.05 Gbps4.8 Gbps480 Mbps

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