Mellanox ConnectX-5EN 100GbE dual port NIC

Discussion in 'DIY Server and Workstation Builds' started by zkrr01, Mar 14, 2019.

  1. zkrr01

    zkrr01 Member

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    Is $626.oo a good price for a 100GbE NIC
     
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  2. i386

    i386 Well-Known Member

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    "It depends"

    Do you need just 100gbe?
    Check ebay for Connect-x4 cards. About 150€ in Germany for a single port card.

    Do you need certain offload features that are not available with older cards?
    Maybe.
     
    #2
  3. zkrr01

    zkrr01 Member

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    I need two 100GbE NIC's that will be direct connected on Dell 8920 workstations. Why do you ask if a just need 100GbE?
    I don't need any offload features, just RDMA.
     
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  4. Rand__

    Rand__ Well-Known Member

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    626 is not really cheap.
    CX4's will also do RDMA, so unless you want newer tech or have money to burn then they will be the better approach.
     
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  5. zkrr01

    zkrr01 Member

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    For new, the best I could find is a MCX415A-CCAT and they were $795 and up.
     
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  6. Rand__

    Rand__ Well-Known Member

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    Ah new. Thats uncommon here;)
    Then 626 is not bad. Which model is it?
     
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  7. zkrr01

    zkrr01 Member

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    MCX416A-CCAT
    I looked for used, but I did not find any 100GbE much cheaper and no assurance they worked!
     
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  8. Rand__

    Rand__ Well-Known Member

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  9. zkrr01

    zkrr01 Member

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    Ok, I ordered two of the MCX456A-ECAT from ebay. Any idea what the part number for a 1 meter direct correct cable?
     
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  10. Rand__

    Rand__ Well-Known Member

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  11. zkrr01

    zkrr01 Member

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    How do I switch the MCX456A card to ethernet?
     
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  12. zkrr01

    zkrr01 Member

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    Never mind, I found the instructions. Thanks a lot Rand, you helped a lot and saved me a lot of money.
     
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  13. Vit K

    Vit K New Member

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    Please post your speed benchmark and full config when you get it working. It will be very useful for 100 gbit early home lab adopters.

    Personally, I think you will not get even near 100 Gbit on your hardware, not speaking about 200. 40-60 Gbit will be max limit. 100 Gbit network transfer speed is achievable only by modern dual socket Xeons with 4-6 channel memory with faster than usual timings according to Netflix paper and my brief datacenter observations. 200 gbit from single server - might be in some tests, but not in protocol speed.
     
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  14. Patrick

    Patrick Administrator
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    Something like this?
     
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