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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    Thanks! I'll buy Mellanox MC2207411-SR4L or Finisar FTL414QB2C transceiver. Most probably the latter, because it is good for longer than 30m distance too. I need this short distance only temporarily, but if it is not possible, then I'll solve it with a single longer cable and a cable channel...
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    Afaik the connector part is very expensive by these cables, while the fibers are relative cheap, that's why length does not matter that much.
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    Thanks! I did not know it. Is there anything else I should know about this MPO/MPT standard? Does the direction matter? How long is the shortest cable possible I could use between keystone modules? What is the minimum bending radius for such cables? Are there flexible ones?
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    I had some time to think about this. I managed to find a 2x8 bifurcation riser for my mobo so I can add both dual port HP Mellanox cards finally. I still did not buy the transceivers and cables. I just checked that both the Mellanox MC2207411-SR4L and the Finisar FTL414QB2C has MPO connector. I...
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    I checked meanwhile on amazon and ebay. You were right MTP is very expensive compared to OM4+LC and a lot more complicated as well. Since optical cables break easier than transceivers I'd rather go with the more expensive transceiver.
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    Well I started with 10 Gbps. I want to finish this 56 Gbps project too. Maybe after it I'll check 100 Gbps, but for now this would be enough for M2 SSD speed. :-) I'll check these MTP cables. I don't need really long ones 5-10 meters at most.
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    I wanted to use OM4 LC/LC keystone modules to go through wall with it and have a proper keystone wall plate. I'll have only 4 devices and only one of them needs such a wall plate. I can keep the others near to each other. Looks like something like this exists, but I am not sure I can buy it from...
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    Yes, this writes it too: EMC 019-078-048 QSFP 4x14G FDR 85C XCVR, MPO, 850nm, FTL414QB2N-E5 Mellanox 56GB | eBay that it works with Mellanox. Thanks, great info again! :) What kind of patch cable can I use for MTP / MPO? I wanted OM4 LC/LC, but I guess that is a completely different story.
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    Ohh and it is cheap as dirt. I am not sure about compatibility though.
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    What kind of transceivers do you use for 56Gbps? I found on the Mellanox website that only Mellanox MC2210411-SR4 is compatible with them and it is rare and more expensive than the HP cards I bought. Is it possible that cheap Cisco SR4 transceivers are compatible with these cards?
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    It is hard to find them second hand, they are still expensive compared to CX3. I just bought 2 dual-port HP CX3 for $60. Or maybe a half brick, I'll figure out next week.
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    You can do it with Mellanox cards and it is cheaper than a QSA.
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    PCIE gen 4.0 to gen 3.0 plx bifurcation

    C_Payne writes here sometimes: PCIE Bifurcation you can ask him if you want a custom card. As far as I remember he was working on PCIE 4 support, but I don't know if he managed to do it. I don't think the PCIE 4 -> PCIE 3 conversion is possible with keeping the bandwidth and doubling the lane...
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    PCIE gen 4.0 to gen 3.0 plx bifurcation

    What about M2? I read on the boards that they support PCIE gen4 M2 x4, so in theory those can be converted to gen3 x8. It would be nice to have an ITX board with 4x8 gen3 lanes all coming from a single x16 gen4 slot plus some x8 coming from M2 too. :D I don't know if the standards allow such...
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    Using a 40GbE (QSFP+) NIC with a 10GbE Switch (SFP+)

    I read that these breakout cables don't work between QSFP+ - SFP+ NICs, they just work on switches, except for a single connector, so you can do basicly 1x QSFP+ -> 1x SFP+ with them between NICs. I'll build a small router+switch+firewall with dual port QSFP+ NICs (MCX354A) and QSFP+ -> 4x SFP+...
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    Flashing stock Mellanox firmware to OEM (EMC) ConnectX-3 IB/Ethernet dual-port QSFP adapter

    Gen2 x4 or gen3 x2 lanes would be a good explanation, it really depends on the motherboard. I had only 6 Gbps with my MCX311A-XCAT and it turned out that my mobo supports only gen2 x2 on the second PCIE x16 slot even though the first slot is gen3. I had to change motherboard to be able to fully...