LG UltraFine 5K - Hub speed tests (external disks)

Discussion in 'Mac Accessories' started by iBrooker, Dec 28, 2016.

  1. iBrooker macrumors 6502

    Joined:
    Nov 20, 2016
    Location:
    Wales
    #1
    Inspired by @Weaselboy's posts, I thought it would be cool to have a dedicated thread for speed tests via the monitors hub. Please post yours here!

    Also see:

    LG UltraFine 5K - Owners Thread

    ---------------------------------------------------------

    Here are my quick tests, interestingly they vary depending on which adapter I use!

    I am using a 128GB Crucial® m4SATA6Gb/s2.5-inchSSD (500GB/s read 175GB/s write) it's a few years old now but the only external SSD I have at present.

    • This cheap USB-C adapter promises speeds up to 10Gbps gives me somewhat mediocre performance:

    Connected directly to Mac - 183 MB/s write and 241 MB/s read
    Connected via the monitor - 161 MB/s write and 232 MB/s read​

    • This one from Sabrent which also promises speeds of up to 10Gbps gives me much better performance:

    Connected directly to Mac - 189 MB/s write and 501 MB/s read
    Connected via the monitor - 189 MB/s write and 348 MB/s read

    I think I will be keeping the Sabrent :D
     
  2. sidewinder macrumors 68020

    sidewinder

    Joined:
    Dec 10, 2008
    Location:
    Northern California
    #2
    I have a LaCie "Porsche Design" 4GB bus powered HDD which has a USB 3.1 Gen. 1 interface (5 Gb/s) using a USB-C connector. It comes with a USB-C to USB-C and a USB-C to USB-A cables. For this test, I used only the USB-C to USB-C cable.

    Connected directly to Mac - 124 MB/s write and 120 MB/s read
    Connected via the monitor - 113 MB/s write and 114 MB/s read
     
  3. slaWter macrumors member

    slaWter

    Joined:
    Dec 22, 2016
    Location:
    Switzerland
    #3
    Good to see a dedicated thread for this. I also meant to pick up on that post.

    Apparently, the USB-C hub is not able to deliver the full Gen. 1 speeds. That is really disappointing since it's only USB 3.0 speeds after all.

    It's probably best to use a dedicated USB hub for faster USB-based external storage, especially for video related tasks.

    I intent to use the integrated hub on one screen for my normal/slower USB peripherals (additional USB 3.0 hub, 8TB external HDD, 2 Time Machine HDDs, MM1 speakers and other small devices). It should still be quick enough for that.
    The other screen's hub would be for faster stuff like USB-C to Ethernet (still ok with these speeds), card readers and also fast (Gen. 1) external SSDs for Lightroom and Bootcamp.
    And that might not be the best idea. I'll have to try it. I rarely have sustained read/write speeds for photo/Lightroom work except when copying but hopefully it's still fast enough. And since each RAW photo is around 85MB it shouldn't slow things down that much. Still, not ideal. I really expected normal USB 3.0 speeds. Due to the longer cables, a small decrease in performance is acceptable but not this much!
     
  4. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #4
    Here is my test from the other thread.

     
  5. dwdrummer959 macrumors newbie

    Joined:
    Feb 3, 2003
    Location:
    US
    #5
    Here's some more data fwiw...

    Software: Blackmagic Disk Speed Test V3.0
    Computer: 2016 15" MBP 2.9Ghz 16GB RAM 1TB SSD Radeon Pro 460
    Drive A: 500GB Samsung T3 SSD
    Drive B: 250GB Samsung T3 SSD
    Both drives were connected to the computer and then the 5K via the included USB-C to USB-A cable and then the Apple USB-A to USB-C dongle (I don't have any USB-C to USB-C cables)

    A: Plugged in to a LEFT TB3 port, write was 396.5 MB/s read was 403.7 MB/s
    A: Plugged in to LG UF 5K monitor, write was 227.2 MB/s read was 292.8 MB/s

    B: Plugged in to a RIGHT TB3 port, write was 400.6 MB/s read was 426.2 MB/s
    B: Plugged in to LG UF 5K monitor, write was 254.2 MB/s read was 342.6 MB/s
     
  6. slaWter, Dec 30, 2016
    Last edited: Dec 30, 2016

    slaWter macrumors member

    slaWter

    Joined:
    Dec 22, 2016
    Location:
    Switzerland
    #6
    Thanks a lot for providing these results dwdrummer959! Similar scenario to what I'd be using (also multiple T3 drives).
    Quite disappointing to see such a big drop off to be honest.

    EDIT:
    It would be interesting to see what happens if you don't send a video stream to the display.
    Can someone please test this:

    -Connect a fast USB 3.0 SSD (400MB/s) to the USB-C hub on the 5K.
    -Disable video output to the monitor (use only the MBP screen).
    -Test the read/write performance of the SSD.

    Those additional 5 Gbit/s shouldn't saturate TB3 next to the 5K stream. Maybe they use a low quality hub or doctored something with the speaker/webcam integration.
     
  7. slaWter macrumors member

    slaWter

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    Dec 22, 2016
    Location:
    Switzerland
    #7
    Bump for my request above. Can anyone please test this? Thanks.
     
  8. dwdrummer959 macrumors newbie

    Joined:
    Feb 3, 2003
    Location:
    US
    #8
    How do you disable the 5k screen when it's plugged in?
     
  9. slaWter macrumors member

    slaWter

    Joined:
    Dec 22, 2016
    Location:
    Switzerland
    #9
    SwitchResX has an option to enable/disable screens. I don't remember if macOS itself has it as well.
     
  10. Outrigger macrumors 68000

    Outrigger

    Joined:
    Dec 22, 2008
    #10
    it doesnt. and even if it does, no one is going disable the 5k screen and use it as a hub for harddrives since that would defeat the purpose of having a 5k screen.
     
  11. slaWter macrumors member

    slaWter

    Joined:
    Dec 22, 2016
    Location:
    Switzerland
    #11
    It would just be a test to see if the hub itself or the internal USB implementation is too slow or if for some reason the 5K stream saturates the TB3 link, which it shouldn't.
    It would obviously just be a temporary setting for this test.
     
  12. maxb macrumors member

    maxb

    Joined:
    Nov 24, 2008
    Location:
    Montréal, Canada
    #12
    Just received my display today, yeah

    one bug I have, the usb hub can't keep up with usb 3 speed, I connected a usb-c 3 to giga ethernet adapter to hit and I don't get more then 440mbps, I get full speed directly connected to the Macbook Pro... I'm I alone?
     
  13. inmotionnow, Jan 12, 2017
    Last edited: Jan 13, 2017

    inmotionnow macrumors regular

    Joined:
    Sep 12, 2014
    Location:
    Toronto
    #13
    Connected to MBP directly (left TB3 port):
    • Seagate Backup Plus via Monoprice Palette Series 3.0 USB-C to USB Micro B Cable: 95.6 MB/s write, 97.2 MB/s read
    • Crucial BX100 SSD in Orico USB 3.1 enclosure via Belkin TB3 Cable: 427.6 MB/s write, 504.1 MB/s read
    Connected to UF 5K:
    • Seagate Backup Plus via Monoprice Palette Series 3.0 USB-C to USB Micro B Cable: 95.1 MB/s write (0.5% reduction), 97.1 MB/s read (0.1% reduction)
    • Crucial BX100 SSD in Orico USB 3.1 enclosure via Belkin TB3 Cable: 251.4 MB/s write (41% reduction), 347.7 MB/s read (31% reduction)
    Looks like I'm getting full speed via the UF 5K with the slower Seagate drive but am taking a significant hit with the SSD.
     
  14. Dukat macrumors regular

    Joined:
    Mar 9, 2012
    #14
    Software: Blackmagic
    Computer: 2016 15" MBP 2.9Ghz 16GB RAM 1TB SSD Radeon Pro 460
    Drive: Samsung T3 SSD (1TB)

    Connected to MBP directly (15", right side port):
    • Read: 434 MB/s
    • Write: 417 MB/s
    Connected to LG 5K:
    • Read: 347 MB/s (20% reduction)
    • Write: 255 MB/s (39% reduction)
     

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