Thunderbolt 3 real speed: 21.6Gbps

Discussion in 'Mac Accessories' started by Mr Dobey, Feb 21, 2017.

  1. Mr Dobey macrumors 6502

    Joined:
    Aug 8, 2008
    #1
    In talks with both Sonnet Tech and Akitio, they have both independently told me that the real world speed of Thunderbolt 3 tops out at 21.6Gbps (2.7GBps) instead of the market 40Gbps. Even with a minor 3% hit from the 128b/130b encoding overhead of PCIe 3.0, these claims are about half of what is advertised. For whatever reason neither company will give a technical breakdown of why this is so.

    Has anyone here made a very fast setup such as RAID 0 of NVMe drives that could test this bandwidth claim over Thunderbolt 3?
     
  2. DRDR macrumors member

    Joined:
    Jul 23, 2008
    #2
    I am using a Thunderbolt 3 to Dual Displayport Adapter, driving two 4K displays. According to the Displayport standard this means the following data rate from one of my Thunderbolt 3 ports to the displays:

    2 x 12,96 GBit/s = 25,92 GBit/s

    This is the exact same data rate used when connecting a 5K display.
     
  3. MrX8503 macrumors 68000

    Joined:
    Sep 19, 2010
    #3
    That's not possible because the LG 5K is using the full 40Gbps.

    5K + 3x USB ports + webcam + speakers = ~40Gbps
     
  4. dyn macrumors 68030

    Joined:
    Aug 8, 2009
    Location:
    .nl
    #4
    Did they also tell you how they tested it and what they used for the test? Without knowing that it's just throwing out numbers which says absolutely nothing at all.
     

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