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

inf3rno

New Member
Mar 24, 2021
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Just a guess, you may have one card in a system's pci-e slot that's only gen 2 x 4 lanes which would net you a max of 16 Gb/s even though the 40Gb link is active.
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 use SFP+. I am thinking on QSFP+ now. If we can buy these cheap cards and convert them to real Mellanox, then SFP+ and QSFP+ have almost the same price.
 

Archos

New Member
Apr 6, 2021
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Can I use a 40G DAC breakout cable to connect HP 656089-001 Infiniband 10/40GB DP NIC 649281-B21 to a singel SFP+ port on the Brocade ICX 6450 and get a singel 10G link? Seems like thats the cheapest option for optics if it works.
 

inf3rno

New Member
Mar 24, 2021
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Can I use a 40G DAC breakout cable to connect HP 656089-001 Infiniband 10/40GB DP NIC 649281-B21 to a singel SFP+ port on the Brocade ICX 6450 and get a singel 10G link? Seems like thats the cheapest option for optics if it works.
You can do it with Mellanox cards and it is cheaper than a QSA.
 

fossxplorer

Active Member
Mar 17, 2016
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Oslo, Norway
I have a couple of ConnectX-3 with 2 Proa. 314-BCCT IIRC. These are not HP branded. Are these just locked to ETH? I have 40GbE working nicely, but wondering about IB support.
Are those HP nics visually branded with a sticker on it?
 

Psynapsx

New Member
Feb 21, 2021
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I bought HP 764284-B21. I think it's a Mellanox MCX353A-FCCT.
Do I have to flash the stock Mellanox firmware to use it in my Supermicro server?