This is closer to what you could achieve max on this platform (max being 12.7 Gbps). Although 20Gbps is the theoretical maximum for a Gen-2 and x4 PCIe link, there are protocol overheads like 8b/10b conversion, flow control mechanism and packet header overheads because of which the achievable actual bandwidth would be less and in case of TX2, it is calculated to be 12.7 Gbps and your value (1.4GB * 8 = 11.2Gbps) is closer to it.
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