With a 2018 iPad Pro, will this LG UltraFine 4K Display provide both 4K / 2160p 60 Hz simultaneously with USB 3 speeds for attached USB peripherals?

If this monitor is plugged into a USB-C iPad Pro, will the monitor be able to display 2160p60 while at the same time allow connections at USB 3 (5 Gbps) speeds for attached USB-C peripherals?

(Most USB-C hubs with HDMI and USB cannot do both USB 3 + 2160p60 at the same time. It's usually either USB 2 + 2160p60 or else USB 3 + 2160p30.)

LG UltraFine 4K Display

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1 Answer from the Community

  • I don't have an answer because Apple's product pages lack these details. But there is a possibility:

    Both the iPad Pro and display need to support two-lane DisplayPort 1.4 to allow 4K60 8bpc RGB and USB 3 (only 8bpc because two-lane DisplayPort 1.4 has only 75% the bandwidth of four-lane DisplayPort 1.2 which can support 4K60 10bpc RGB).

    For the iPad Pro, Apple's product page does not mention DP 1.4 or 5K or HBR3 but it does mention HDR which is a feature of DP 1.4. It also says it supports 4K using the USB-C Digital AV Multiport Adapter and the product page for that adapter says 4K60. I have that adapter and it supports two-lane DP 1.4 and USB 3 (but I don't know how it operates with an iPad Pro).

    On the LG UltraFine 4K side, you might be out of luck. It probably uses four-lane DP 1.2 + PCIe over Thunderbolt for 4K60 and USB 3 and it probably uses four-lane DP 1.2 and USB 2 for computers (and iPad Pro) that only support USB-C with DP alt mode.

    If the iPad Pro supports two-lane DP 1.4 with USB 3 and the display only supports DP 1.2 with USB 2, then you need a device to convert from one to the other such as a DP 1.4 MST hub. The HP Thunderbolt Dock G2 contains a DP 1.4 MST hub. It supports two-lane DP 1.4 with USB 3 input when connected to a computer's non-Thunderbolt USB-C with DP alt mode port. The dock has two DP ports and a USB-C with DP alt mode port that are the three outputs of the internal MST hub (the VGA port overrides the DP connection of the USB-C port). Connect the display to the USB-C with DP alt mode port.

    I have not tested the HP Thunderbolt Dock G2's ability to convert two-lane DP 1.4 to four-lane DP 1.2. The ability may also depend on the iPad Pro's external display driver. macOS doesn't support multiple displays connected via MST hub. I assume iPadOS would have the same limitation. But macOS does support a single display connected to an MST hub so maybe it will work.

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