iMac 2019 Ports

Discussion in 'iMac' started by Jong875, Apr 26, 2019.

  1. Jong875 macrumors member

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    #1
    It's hard to find this info, but are the 4 USB ports 3.1 Gen 1 or Gen 2?
     
  2. jerwin macrumors 68020

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    #2
    Four USB 3 ports (compatible with USB 2)

    Two Thunderbolt 3 (USB-C) ports with support for:
    • DisplayPort
    • Thunderbolt (up to 40Gb/s)
    • USB 3.1 Gen 2 (up to 10Gb/s)
    https://www.apple.com/imac/specs/

    If you want 4 usb 3.2gen2 ports, you'll need an imac pro
     
  3. CheesePuff macrumors 6502a

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    #3
    Huh? There is no 3.2 gen 2, and the iMac and iMac Pro have the same 3.1 gen 2.
     
  4. Jong875 thread starter macrumors member

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    #4
    Their site doesn’t make it clear. Technically there is no USB 3 anymore it’s either 3.1 Gen 1 or Gen 2.
     
  5. jerwin macrumors 68020

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    #5
  6. CheesePuff macrumors 6502a

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    #6
  7. Jong875 thread starter macrumors member

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    #7
    I do not see it state anywhere that it is 3.1 gen 2. It just says USB 3. It states the thunderbolt can support USB 3.1 Gen 2
     
  8. CheesePuff macrumors 6502a

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    #8
    Yes, the 2 Thunderbolt 3 USB Type C ports support 3.1 gen 2, not the USB Type A ports.
     
  9. Jong875 thread starter macrumors member

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  10. CheesePuff macrumors 6502a

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    #10
  11. Jong875, Apr 27, 2019
    Last edited: Apr 27, 2019

    Jong875 thread starter macrumors member

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    #11
    It is very unclear. It says USB 3. Doesn’t say if it’s 3.0 (which the term doesn’t exist anymore),3.1 Gen 1 or Gen 2.
     

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  12. CheesePuff macrumors 6502a

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    #12
    Yes it does:

    USB 3.1 Gen 2 can transfer data up to 10 Gbps. Newer Mac models with Thunderbolt 3 (USB-C) ports support these speeds.

    Only the TB 3 USB Type C ports are 3.1 gen 2.
     
  13. gilby101, Apr 27, 2019
    Last edited: Apr 27, 2019

    gilby101 macrumors regular

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    #13
    All the Apple specs say USB 3 (same as saying USB 3.0). That is a standard will exist for ever - standards never die, they just become superseded.

    USB 3 is very similar to the USB 3.1gen1 and USB 3.2gen1 standards, just not quite the same. All are up to 5 Gb/s and backward compatible to USB 2.

    The 4 big USB-A ports on the iMac are USB 3. And will work with devices quoted as being USB 3.1gen1 as well as USB 3 and USB 2 (or even older).

    The 2 smaller USB-C ports can use either Thunderbolt 3 (40 Gb/s) and USB 3.1gen2 (10 Gb/s).

    Note that USB-A and USB-C refer to the standard for the physical design of the port. USB 2, 3, 3.1, etc. refer to the signalling and data transfer standards. Have a skim read of https://en.wikipedia.org/wiki/USB_3.0
     
  14. Jong875 thread starter macrumors member

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    #14
    Thank you. Explained perfectly.
     
  15. JacobHarvey, Apr 27, 2019
    Last edited: Apr 27, 2019

    JacobHarvey macrumors newbie

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    #15
    I find it slightly annoying how the regular USB-A ports seem to be USB 3.1 Gen 1 (5Gbps) instead of Gen 2 (10Gbps) in 2019.

    The coffeelake chipset used (most likely a Z390 model) can natively support 6 USB 3.1 Gen 2 10Gbps ports (which would easily cover the 4 USB-A ports, internal SDXC card reader, and webcam) in addition to up to 14 USB 2.0 ports for everything else (e.g. internal microphones).

    If Apple just made the USB A ports Gen 2 speed this would save us having to ‘waste’ a thunderbolt port when connecting a fast USB SSD for best speeds.

    The 2019 iMac as a whole seems great but little details like this, where the full potential of its components is not used, irk me.
     
  16. Jong875 thread starter macrumors member

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    #16
    They could have easily upgraded the port without changing anything to the iMac
     
  17. Fishrrman, Apr 28, 2019
    Last edited: Apr 28, 2019

    Fishrrman macrumors P6

    Fishrrman

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    #17
    What needs to be done to resolve this question:

    First, we need someone who has one of the new 2019 iMacs.

    That person will need a USBc 3.1 gen2/nvme enclosure that has an nvme SSD inside.

    Then, run a speed test on the drive connected to the USBc port.
    Then, repeat the speed test with the drive connected to a USBa port.

    How do the results stack up?
     
  18. SpecFoto macrumors member

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    #18
    It is the same with the SDXC port on the 2019 iMac. It is a UHS-1 slot, only the 2 year old iMac Pro is a UHS-II slot. WTF Apple??
     
  19. mcnallym macrumors 6502a

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    Oct 28, 2008
    #19
    Z370 boards can support 9th and 8th gen cpu’s. May need an Efi/bios update so most likely that apple updated the firmware in the iMac to support the cpu’s without changing the chipset or anything else so literally bare min change to the system.

    Hence why nothing else changed
     
  20. Zdigital2015, Apr 28, 2019
    Last edited: Apr 28, 2019

    Zdigital2015 macrumors 65816

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    #20
    The 2019 iMac is the first iMac to use the 300-Series PCH. The 2015 and 2017 iMacs used a Z170 (100-Series) PCH. At the present, I am not sure anyone knows which exact PCH Apple chose for the 2019 iMac. The Z370 PCH does not support USB 3.1 Gen 2, but the the Z390 PCH does support up to 6 directly off the PCH, which would have been nice for Apple to have supported by repacking the Type-A port with Type-C ports. I suspect that would confuse typical consumers thinking they were Thunderbolt 3 and so they opted to leave them as Type-A.

    EDIT: To clarify, the 100-Series PCH does not work with 8th or 9th Gen CPUs. Apple may have chosen the C246 PCH (server Z390) as it chose the CM246 PCH for the mini.
     
  21. Zdigital2015 macrumors 65816

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  22. Jong875 thread starter macrumors member

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    #22
    Now would adding a USB Hub to the thunderbolt 3 slot to add additional thunderbolt 3 ports slow down that port or would all the extra ports on the hub be able to run at full speed?
     
  23. gilby101 macrumors regular

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    #23
    Thunderbolt 3 connects multiple devices using a daisy chain (like Firewire). So hubs have, at most, 2 TB3 ports - one to connect to computer and one to connect to another TB3 device. The iMac is limited to two daisy chains. Arguably the best hub (without space for disk drives) is the Caldigit T3 Plus - this adds two USB3.1gen2 ports as well as slower ones.. The USB ports should not slow down the TB3 daisy chain except that you are limited by the 40 Gb/s of TB3.
     

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22 April 26, 2019