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PCI-E lane speed vs NIC throughput



The Next CEO of Stack OverflowPCI Express x4 network card into PCI-Express x16 slot?How to check at which PCI-Express mode a NIC operatesPCI-X compatible with PCI ExpressPCI-E HBA on only PCI-E x16 slot on motherboard?PCI-E Connection between two servers?PCI Express x1 Network Card on PCI Express x8 slotPCIe x8 NIC in PCIe x16 slotMove a NIC to another PCIe slotForce renegotiation of PCI Express link speed? x2 card reverts to x1 widthDetermining speed of PCI Express










0















I am curious about NIC troughput vs PCIE slot speed.
I have found Mellanox MHQH19B-XTR which claims to be 40 Gbps PCI-E 2.0 x8 cards.
However, this slot limit seems to be theoretical ~ 31 Gbps.



So, what's going on?
How these speeds are acheived if I put it into router that's need to read all the packets? In my view they need to be transmitted via PCIE slot to be read by OS. Anyone can explain?










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    0















    I am curious about NIC troughput vs PCIE slot speed.
    I have found Mellanox MHQH19B-XTR which claims to be 40 Gbps PCI-E 2.0 x8 cards.
    However, this slot limit seems to be theoretical ~ 31 Gbps.



    So, what's going on?
    How these speeds are acheived if I put it into router that's need to read all the packets? In my view they need to be transmitted via PCIE slot to be read by OS. Anyone can explain?










    share|improve this question







    New contributor




    curious is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      0












      0








      0








      I am curious about NIC troughput vs PCIE slot speed.
      I have found Mellanox MHQH19B-XTR which claims to be 40 Gbps PCI-E 2.0 x8 cards.
      However, this slot limit seems to be theoretical ~ 31 Gbps.



      So, what's going on?
      How these speeds are acheived if I put it into router that's need to read all the packets? In my view they need to be transmitted via PCIE slot to be read by OS. Anyone can explain?










      share|improve this question







      New contributor




      curious is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I am curious about NIC troughput vs PCIE slot speed.
      I have found Mellanox MHQH19B-XTR which claims to be 40 Gbps PCI-E 2.0 x8 cards.
      However, this slot limit seems to be theoretical ~ 31 Gbps.



      So, what's going on?
      How these speeds are acheived if I put it into router that's need to read all the packets? In my view they need to be transmitted via PCIE slot to be read by OS. Anyone can explain?







      nic pci-express






      share|improve this question







      New contributor




      curious is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      curious is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      curious is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked 20 hours ago









      curiouscurious

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