ebay Mellanox ConnectX-3 Dual 40/56GbE MCX314A-BCBT - $90 each OBO

Discussion in 'Great Deals' started by K D, Sep 5, 2017.

  1. K D

    K D Well-Known Member

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    Found this while looking for a 40GBe card. The seller accepted $50 BO for 4.

    Mellanox Dual 40/56GbE QSFP CX314A ConnectX-3 40GB MCX314A-BCBT #TQ1304 | eBay

    Not sure if it is a great deal but seems decent enough looking at other ebay listings.

    On a different note, this is my first 40GB card. Can someone point me to a QSPF cable that I can use? The idea is to direct connect 2 of these cards in 2 different hosts.
     
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  2. zhoulander

    zhoulander Active Member

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    Nice price for $50!
    I've been using these:
    Mellanox HP 498386-B23 3M 4x DDR/QDR QSFP IB Fiber Optic Cable
     
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  3. i386

    i386 Well-Known Member

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    Check the search results for "qsfp sas" on ebay. I got that way two 3m brocade qsfp+ cables for $12 each.
     
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  4. fossxplorer

    fossxplorer Active Member

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    So these are restricted to 40GbE only while e.g ConnectX-3 VPI supports both 40GbE and 56Gb IB?
    I do have access to MT27500 adapters, ConnectX-3 VPI, just wondering what the difference is..
     
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  5. gigatexal

    gigatexal I'm here to learn

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    I’m this has been asked before but can you run these from computer to computer without much fuss?
     
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  6. K D

    K D Well-Known Member

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    The description says 40 and 56GBe. Thr model number on the listing also can do both as per the mellanox website. I don't know beyond that.
     
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  7. K D

    K D Well-Known Member

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    I hope so.
     
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  8. Patrick

    Patrick Administrator
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    You can. Nice find.
     
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  9. K D

    K D Well-Known Member

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    Thanks for the Confirmation @Patrick.

    What kind of cable will I need to connect this card to an SFP+ port on a switch?
     
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  10. _alex

    _alex Active Member

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    Mellanox QSA plus dac or sfp's and fibre. But not 100% sure the QSA works on the NIC side.

    Wonder if the cards can be flashed to a VPI firmware, too.
     
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  11. trumee

    trumee Member

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    Which SFP+ transreceiver will work with this?

    Sent from my SM-N910T using Tapatalk
     
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  12. AT S37=0

    AT S37=0 Member

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    No SFP+, use QSFP+. I don't believe you can break it up into 4 lanes like you can a switch. Search ebay for "HP 498386-B28 30M" -- I have one of these running across my roof to the basement with these cards :)
     
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  13. trumee

    trumee Member

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    That looks like a DAC cable rather than a transceiver. Will this work?
     
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  14. i386

    i386 Well-Known Member

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    This works fine with my nics (qsfp+) and switch (sfp+).
     
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  15. AT S37=0

    AT S37=0 Member

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    Looks like I'm incorrect here, qsfp+ to sfp+ may work NIC to switch.

    Yeah, it is a DAC, an Active Optical Cable, since it runs 30 meters, and it has a Mellanox transceivers.

    Those optics would most likely work (I don't have it), but this will definitely work: MC2210411-SR4, since it is Mellanox branded.


     
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    Last edited: Sep 6, 2017
  16. Egbert

    Egbert New Member

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    Seller countered with $75 each for qty 6 as they were down to their last few units. Still doesn't seem to be too bad a deal, as I needed them for my homelab refresh over the next month. I'll probably eat my words though if the seller relists a new batch.
     
    #16
  17. K D

    K D Well-Known Member

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    I m completely baffled by the choices for cables available on eBay. Can someone post a link to a cheap compatible cable. Preferably 1-2m long.

    Thanks in advance.
     
    #17
  18. i386

    i386 Well-Known Member

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    QSFP14 cables for fdr infiniband or 56gbe: (00w0057,mc2207128) on ebay
     
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  19. Egbert

    Egbert New Member

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    #19
  20. K D

    K D Well-Known Member

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    Recieved my cards today. They were packed well but no anti static bags. Just wrapped in bubble wrap and in a well padded box.

    Physically they seem OK. Will test them over the weekend. I can only check whether they are recognized by the system. I don't have the cables in hand yet.

    Can these be used with a QSPF to 4 SFP+ breakout cable to direct connect hosts?
     
    #20
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