Are all Infiniband CX4 cables work the same (support both SDR and DDR rate)?

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rampage666

Member
Nov 18, 2016
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Hi fellows,

Are all Infiniband CX4 cables work the same (support both 10Gb SDR and 20Gb DDR rate)?
Or actually there are some kind of standards only some CX4 cables can do 20Gb DDR?

Same question goes for 40Gb QDR and 56Gb FDR QSFP cables.
 
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TedB

Active Member
Dec 2, 2016
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To best of my knowledge from electrical point of view they are the same, however the achievable speeds depend on the quality. Therefore certified cables for given speed should be fine, others may work. We use same QSFP cables for QDR and FDR to connect to switch and it works fine. No experience with CX4 cables.
 
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