QDR

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IB Quadruple Data Rate (QDR) is the communication rate defined by InfiniBand (IB). It is equivalent to 40 Gbps IB. The E9000 CX611 and CX610 switch modules support QDR and FDR autonegotiation.

Other related questions:
Differences between MELLANOX QDR 40 GB/s IB cards and FDR 56 GB/s IB cards
QDR 40 GB/s IB cards and FDR 56 GB/s IB cards provide different transmission rates.

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