I used it to connect a Mellanox ConnectX-3 40Gbe card to a 40Gbe port on a MikroTik CRS326-24S+2Q+RM switch. It was recognized correctly and I was able to send 40 Gb/s over the line normally. I previously ordered a similar cable from FS.com and it didn't work at 40Gbps (I could only get it to work at 10Gbps, 40Gbps didn't work with no connection).
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